ci: Add Python version input to setup-uv action and update workflow configuration (#5288)

* feat: add input for Python version in setup-uv action

* Introduced a new input parameter 'python-version' to allow users to specify the Python version for the setup-uv action, defaulting to 3.12.
* Updated the action to use the new input instead of relying on a version file.

* fix: update Python version setup in GitHub Actions workflow

* Changed the Python version setup in the GitHub Actions workflow to use a matrix input instead of a version file, enhancing flexibility and allowing for dynamic version specification.
* This change applies to both the main job and the test job in the workflow configuration.

* chore: update Python version in GitHub Actions workflow to 3.12

* Changed the Python version setup in the GitHub Actions workflow from using a version file to directly specifying Python 3.12, ensuring consistency and clarity in the environment configuration.

* chore: add environment variables for OpenAI and Astra DB in GitHub Actions workflow

* Introduced new environment variables for OPENAI_API_KEY, ASTRA_DB_API_ENDPOINT, and ASTRA_DB_APPLICATION_TOKEN in the store_pytest_durations.yml workflow file to enhance integration capabilities and secure access to necessary APIs.