ci: improve ansible collection install robustness and pre-commit performance

[l50]

Key Changes:

• Implement retry logic for Ansible collection installation in CI workflows
• Add caching for Ansible collections to speed up pre-commit CI runs
• Restrict pre-commit Ansible hooks to only run on relevant files for efficiency

Added:

• Ansible collections caching step in pre-commit GitHub Actions workflow to utilize cache based on requirements.yml hash

Changed:

• Ansible collection install steps in molecule and pre-commit workflows now use up to five retries with increasing sleep intervals and explicit timeout settings to reduce transient failures
• Set ANSIBLE_GALAXY_SERVER_TIMEOUT environment variable to 120 seconds for more robust dependency installs in CI
• Pre-commit Ansible lint and documentation hooks now only run on changes within the ansible/ directory and no longer always run, improving CI performance and reducing unnecessary runs

Removed:

• Automatic always-run behavior for pre-commit Ansible lint and documentation hooks, limiting their scope to relevant file changes