Add Generic Cooldown Filtering and Enable for Python Package Manager

[kbukum1]

What are you trying to accomplish?

This PR introduces a generic cooldown filtering mechanism that can be applied to all ecosystems when enabled. Initially, this feature is enabled for the Python package managers to regulate update frequency and prevent unnecessary frequent version bumps.

The cooldown mechanism ensures that only versions that have surpassed the configured cooldown period are considered when determining the latest available versions.

Anything you want to highlight for special attention from reviewers?

• The implementation is generic, allowing other ecosystems to opt into cooldown filtering in the future.
• Currently, it is enabled only for Python (PIP).
• Cooldown filtering is applied during version retrieval, ensuring updates follow cooldown rules.
• This implementation aligns with existing cooldown logic used elsewhere in Dependabot.

How will you know you've accomplished your goal?

• Versions that do not meet the cooldown criteria are correctly filtered out.
• The latest version selection process adheres to the configured cooldown settings.
• Unit tests confirm that cooldown filtering works as expected across different update scenarios.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[thavaahariharangit]

LGTM