chore: remove pip_repository_annotations example (#3622)

This PR deletes the `pip_repository_annotations` example. This is
because it is a workspace-only example, and its removal is preparatory
work for dropping workspace support from rules_python.

Author: rickeylev

.bazelci/presubmit.yml

@@ -433,31 +433,6 @@ tasks:
   # We don't run pip_parse_vendored under Windows as the file checked in is
   # generated from a repository rule containing OS-specific rendered paths.
 
-  integration_test_pip_repository_annotations_ubuntu_workspace:
-    <<: *reusable_build_test_all
-    <<: *common_workspace_flags
-    name: "examples/pip_repository_annotations: Ubuntu, workspace"
-    working_directory: examples/pip_repository_annotations
-    platform: ubuntu2204
-  integration_test_pip_repository_annotations_debian_workspace:
-    <<: *reusable_build_test_all
-    <<: *common_workspace_flags
-    name: "examples/pip_repository_annotations: Debian, workspace"
-    working_directory: examples/pip_repository_annotations
-    platform: debian11
-  integration_test_pip_repository_annotations_macos_workspace:
-    <<: *reusable_build_test_all
-    <<: *common_workspace_flags
-    name: "examples/pip_repository_annotations: macOS, workspace"
-    working_directory: examples/pip_repository_annotations
-    platform: macos_arm64
-  integration_test_pip_repository_annotations_windows_workspace:
-    <<: *reusable_build_test_all
-    <<: *common_workspace_flags
-    name: "examples/pip_repository_annotations: Windows, workspace"
-    working_directory: examples/pip_repository_annotations
-    platform: windows
-
   integration_test_bazelinbazel_ubuntu:
     <<: *common_bazelinbazel_config
     name: "tests/integration bazel-in-bazel: Ubuntu"

examples/pip_repository_annotations/.bazelrc

@@ -266,8 +266,7 @@ pip_repository = repository_rule(
             doc = """\
 Optional annotations to apply to packages. Keys should be package names, with
 capitalization matching the input requirements file, and values should be
-generated using the `package_name` macro. For example usage, see [this WORKSPACE
-file](https://github.com/bazel-contrib/rules_python/blob/main/examples/pip_repository_annotations/WORKSPACE).
+generated using the `package_name` macro.
 """,
         ),
         _config_template = attr.label(