Retry release smoke package install

[tconley1428]

What changed

• Adds a bounded retry loop around the initial release package install in the shared smoke-test helper.
• Uses --no-cache-dir for that install so retries re-check the package index.
• Leaves dependency installation and pip check fail-fast after the release package resolves.

This covers both TestPyPI and PyPI smoke tests because both use .github/actions/release-smoke-package.

Why

The 1.29.0 release run uploaded successfully to TestPyPI, but the immediate smoke install saw a stale simple index that still ended at 1.28.0. A rerun several minutes later hit the same cached index from the runner. Retrying the package install handles package-index propagation without sleeping longer than needed.

Validation

• uv run ruff check .github/scripts/install_release_package.py
• uv run ruff format --check .github/scripts/install_release_package.py
• python3 -m py_compile .github/scripts/install_release_package.py
• Exercised _pip_install_with_retries with mocked transient failures
• Installed temporalio==1.29.0 from TestPyPI in a temporary venv with .github/scripts/install_release_package.py