Use pydantic dataclass instead of stdlib dataclass

Pydantic's dataclass does not complain about optional attributes before
required attributes, so we can drop `--kw-only` from the `xsdata` call
(which is now `xsdata ../xsd/galaxy.xsd --unnest-classes --output
pydantic --docstring-style Accessible --ignore-patterns
--max-line-length 10000 && python postprocess_schema.py && python
test_file_from_xsd.py > test_file_schema.json && cd ~/src/galaxy && make
format && cd -`)

lib/galaxy/tool_util/schemas/generated/galaxy.py

@@ -1,7 +1,4 @@
-from dataclasses import (
-    dataclass,
-    field,
-)
+from dataclasses import field
 from decimal import Decimal
 from enum import Enum
 from typing import (
@@ -10,6 +7,8 @@
     Union,
 )
 
+from pydantic.dataclasses import dataclass
+
 from .config import (
     BaseSetting,
     ClassCollectionField,

lib/galaxy/tool_util/schemas/test_file_from_xsd.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import json
-from dataclasses import dataclass
 from typing import Union
 
 # bug with pydantic, need everything in namespace, otherwise fails with
@@ -17,6 +16,7 @@
     ConfigDict,
     RootModel,
 )
+from pydantic.dataclasses import dataclass
 
 extra_forbidden = ConfigDict(extra="forbid")