feat(ci): add Test PyPI release workflow for splunk-ao

[adityamehra]

Summary

• Adds .github/workflows/release-splunk-ao-test.yaml — a workflow_dispatch pipeline that builds and publishes the splunk-ao package to Test PyPI
• Uses PyPI Trusted Publisher (OIDC) — no stored API token needed
• Matches the pending Trusted Publisher already configured on test.pypi.org (workflow: release-splunk-ao-test.yaml, environment: testpypi)

How it works

1. Trigger manually from the Actions tab with an optional version override
2. If a version is supplied, it patches pyproject.toml and src/splunk_ao/__init__.py locally (no commit back to the branch)
3. Builds the package with Poetry 2.4.1
4. Publishes to Test PyPI via OIDC

Test plan

• Merge this PR
• Trigger the workflow from the Actions tab with version 0.1.0b1
• Confirm the package appears at https://test.pypi.org/project/splunk-ao/

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