Fix/hybim 807 renaming resource dir path

[pradystar]

Summary

• Point autogenerated API client output at src/splunk_ao/resources (was src/galileo/resources) and rewrite the generated galileo.exceptions / galileo.utils.headers_data imports to splunk_ao.*.
• Fix the codegen seam so regeneration stays correct: codegen_templates/endpoint_module.py.jinja now emits splunk_ao.* imports, and scripts/auto-generate-api-client.sh writes to the new path.
• Sweep every non-generated caller (src/splunk_ao/, tests/, examples/, README_API_CLIENT.md, @patch(...) targets) from galileo.resources to splunk_ao.resources.
• Delete the legacy src/galileo/ compatibility shim (__init__.py, exceptions.py, utils/) and the now-obsolete tests/test_namespace_compatibility.py.
• Remove the dead _splunk_ao_suppress_galileo_deprecation_warning flag from src/splunk_ao/__init__.py (only existed to silence the deleted shim) and drop the galileo.resources. branch in utils/headers_data.py.
• Update tooling config: pyproject.toml (drop galileo package include, retarget ruff exclude and coverage omit), .pre-commit-config.yaml, and tasks.py mypy exclude.

Notes

• The generated tree was relocated with git mv + a two-line import rewrite (not a full regen), preserving git rename history and avoiding post-hook formatting churn. The result matches what a regen now produces because the template was fixed.
• Intentionally left in place: SplunkAOConfig._bridge_env_vars() (bridges SPLUNK_AO_* -> GALILEO_* for the external galileo-core dep), the X-Galileo-SDK header value, and galileo.ai URLs/docstrings sourced from openapi.yaml.

Test plan

• poetry install --all-extras --no-root
• poetry run pytest
• poetry run pre-commit run --all-files (ruff + mypy clean)
• ./scripts/auto-generate-api-client.sh yields an empty diff (not run created https://splunk.atlassian.net/browse/HYBIM-853)
• python -c "import splunk_ao; from splunk_ao.resources.api.auth import login_api_key_login_api_key_post" succeeds
• import galileo fails (namespace fully removed)