Fix: fix mock_modules generated stubs failing YAML/doc parsing #5031

[santosh7676]

Fix mock_modules generated stubs failing YAML/doc parsing

This MR fixes a bug where mock_modules generated Python stubs could fail ansible-lint checks due to invalid module-doc block content.

Problem

When using mock_modules, generated stubs used:

• EXAMPLES = '''mocked'''
• RETURN = '''mocked'''

In some environments/paths, these values triggered YAML/module-doc parsing failures and caused lint errors on generated mock module files.

Fix

• Updated mocked module template to:
• use valid YAML content in EXAMPLES
• use the no-return sentinel for RETURN (r""" + # """)

Tests

• Added a regression test in test/test_mockings.py to cover the mock_modules scenario and ensure generated stubs are lintable.

#5013

[santosh7676]

Looks like CI Issue, it is failing in test_import_tasks[1] (Runner lintables count for examples/playbooks/test_import_with_malformed.yml), in both py314-devel and py312-devel jobs.

This PR only changes:

• src/ansiblelint/constants.py (mocked module template docs)
• test/test_mockings.py (mock_modules regression test)

So this appears unrelated/pre-existing.

[felixfontein]

Yep, the CI seems to be broken at the moment...