test: Fix the Bazel integration test. (#9604)

Bazel just released version 8.0.0 which uses a MODULE.bazel file instead
of a WORKSPACE file. See https://bazel.build/external/migration

I also updated to a new version of rules_oci that supports this new
MODULE.bazel.

integration/testdata/bazel-rules-oci/BUILD

@@ -1,7 +1,13 @@
-load("@rules_oci//oci:defs.bzl", "oci_tarball")
+load("@rules_oci//oci:defs.bzl", "oci_load")
 
-oci_tarball(
-    name = "hello.tar",
+oci_load(
+    name = "hello",
     image = "@hello//:hello",
     repo_tags = ["hello:latest"],
 )
+
+filegroup(
+    name = "hello.tar",
+    srcs = [":hello"],
+    output_group = "tarball",
+)

integration/testdata/bazel-rules-oci/MODULE.bazel

@@ -0,0 +1,13 @@
+bazel_dep(name = "rules_oci", version = "2.0.1")
+
+oci = use_extension("@rules_oci//oci:extensions.bzl", "oci")
+
+# Declare external images you need to pull, for example:
+oci.pull(
+    name = "hello",
+    digest = "sha256:b510f29de2dfd80b88f7cd569db177a514117081bc8825eb64e423bd3db0fe64",
+    image = "us-docker.pkg.dev/google-samples/containers/gke/hello-app",
+)
+
+# For each oci.pull call, repeat the "name" here to expose them as dependencies.
+use_repo(oci, "hello")

integration/testdata/bazel-rules-oci/sub-dir/BUILD

@@ -1,7 +1,13 @@
-load("@rules_oci//oci:defs.bzl", "oci_tarball")
+load("@rules_oci//oci:defs.bzl", "oci_load")
 
-oci_tarball(
-    name = "hello.tar",
+oci_load(
+    name = "hello",
     image = "@hello//:hello",
-    repo_tags = ["hello-whatever:latest"],
+    repo_tags = ["hello:latest"],
+)
+
+filegroup(
+    name = "hello.tar",
+    srcs = [":hello"],
+    output_group = "tarball",
 )