Fix test_composite_datatype_stage_upload1 test

Can be squashed into commit "Record unnamed_outputs as job outputs, wait for job outputs in staging function" .

Fix the following traceback:

```
self = <galaxy_test.api.test_tools_upload.TestToolsUpload object at 0x7f309146b550>
history_id = '333add226b1f5083'

    @skip_without_datatype("velvet")
    def test_composite_datatype_stage_upload1(self, history_id: str) -> None:
        job = {
            "input1": {
                "class": "File",
                "format": "velvet",
                "composite_data": [
                    "test-data/simple_line.txt",
                    "test-data/simple_line_alternative.txt",
                    "test-data/simple_line_x2.txt",
                ],
            }
        }
>       stage_inputs(self.galaxy_interactor, history_id, job, use_path_paste=False, use_fetch_api=False)

lib/galaxy_test/api/test_tools_upload.py:497:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
lib/galaxy_test/base/populators.py:3181: in stage_inputs
    return InteractorStaging(galaxy_interactor, use_fetch_api=use_fetch_api).stage(
lib/galaxy/tool_util/client/staging.py:264: in stage
    return galactic_job_json(
lib/galaxy/tool_util/cwl/util.py:392: in galactic_job_json
    replace_keys[key] = replacement_item(value)
lib/galaxy/tool_util/cwl/util.py:220: in replacement_item
    return replacement_file(value)
lib/galaxy/tool_util/cwl/util.py:251: in replacement_file
    rval_c = upload_file_with_composite_data(None, composite_data, filetype=filetype, **kwd)
lib/galaxy/tool_util/cwl/util.py:190: in upload_file_with_composite_data
    return response_to_hda(target, upload_response)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

target = <galaxy.tool_util.cwl.util.FileUploadTarget object at 0x7f30044f61c0>
upload_response = {'implicit_collections': [], 'jobs': [{'create_time': '2024-04-02T13:19:27.579575', 'exit_code': None, 'galaxy_version...ats': ['http://edamontology.org/format_1915'], 'data_type': 'galaxy.datatypes.data.Data', 'deleted': False, ...}], ...}

    def response_to_hda(target: UploadTarget, upload_response: Dict[str, Any]) -> Dict[str, str]:
>       dataset = next(iter(upload_response["outputs"].values()))
E       AttributeError: 'list' object has no attribute 'values'

lib/galaxy/tool_util/cwl/util.py:160: AttributeError
```

lib/galaxy/tool_util/client/staging.py

@@ -59,18 +59,16 @@ def _post(self, api_path: str, payload: Dict[str, Any]) -> Dict[str, Any]:
     def _attach_file(self, path: str) -> BinaryIO:
         return open(path, "rb")
 
-    def _tools_post(self, payload: Dict[str, Any]) -> Dict[str, Any]:
+    def _job_details_from_tool_response(self, tool_response: Dict[str, Any]) -> List[Dict[str, Any]]:
+        return [self._handle_job(job) for job in tool_response.get("jobs", [])]
+
+    def _tools_post(self, payload: Dict[str, Any]) -> List[Dict[str, Any]]:
         tool_response = self._post("tools", payload)
-        for job in tool_response.get("jobs", []):
-            self._handle_job(job)
-        return tool_response
+        return self._job_details_from_tool_response(tool_response)
 
     def _fetch_post(self, payload: Dict[str, Any]) -> List[Dict[str, Any]]:
         tool_response = self._post("tools/fetch", payload)
-        job_details = []
-        for job in tool_response.get("jobs", []):
-            job_details.append(self._handle_job(job))
-        return job_details
+        return self._job_details_from_tool_response(tool_response)
 
     @abc.abstractmethod
     def _handle_job(self, job_response: Dict[str, Any]) -> Dict[str, Any]:
@@ -206,12 +204,12 @@ def _attach_file(upload_payload: Dict[str, Any], uri: str, index: int = 0) -> No
                         _attach_file(upload_payload, composite_data, index=i)
 
                 self._log(f"upload_payload is {upload_payload}")
-                return self._tools_post(upload_payload)
+                return self._tools_post(upload_payload)[0]
             elif isinstance(upload_target, FileLiteralTarget):
                 # For file literals - take them as is - never convert line endings.
                 payload = _upload_payload(history_id, file_type="auto", auto_decompress=False, to_posix_lines=False)
                 payload["inputs"]["files_0|url_paste"] = upload_target.contents
-                return self._tools_post(payload)
+                return self._tools_post(payload)[0]
             elif isinstance(upload_target, DirectoryUploadTarget):
                 tar_path = upload_target.tar_path
 
@@ -221,20 +219,21 @@ def _attach_file(upload_payload: Dict[str, Any], uri: str, index: int = 0) -> No
                 )
                 upload_payload["inputs"]["files_0|auto_decompress"] = False
                 _attach_file(upload_payload, tar_path)
-                tar_upload_response = self._tools_post(upload_payload)
+                tar_upload_first_job_details = self._tools_post(upload_payload)[0]
+                tar_upload_first_dataset_id = next(iter(tar_upload_first_job_details["outputs"].values()))["id"]
                 convert_payload = dict(
                     tool_id="CONVERTER_tar_to_directory",
-                    tool_inputs={"input1": {"src": "hda", "id": tar_upload_response["outputs"][0]["id"]}},
+                    tool_inputs={"input1": {"src": "hda", "id": tar_upload_first_dataset_id}},
                     history_id=history_id,
                 )
-                convert_response = self._tools_post(convert_payload)
+                convert_response = self._tools_post(convert_payload)[0]
                 assert "outputs" in convert_response, convert_response
                 return convert_response
             elif isinstance(upload_target, ObjectUploadTarget):
                 content = json.dumps(upload_target.object)
                 payload = _upload_payload(history_id, file_type="expression.json")
                 payload["files_0|url_paste"] = content
-                return self._tools_post(payload)
+                return self._tools_post(payload)[0]
             else:
                 raise ValueError(f"Unsupported type for upload_target: {type(upload_target)}")