Add configurable commit lookback

[rikwasmus]

Summary

• Add a commit_lookback_days git config option for commit ingestion.
• Keep the existing default behaviour of 31 days when the option is omitted.
• Pass the configured value through GitHub, GitHub GraphQL, GitLab, Bitbucket Cloud, and Bitbucket Server commit collection paths.

Motivation

For large installations that run the agent frequently, always refetching the last 31 days of commits can make each run much longer than necessary. This lets customers tune the steady-state commit lookback window without changing backpopulation behaviour or PR ingestion.

Testing

• uv run pytest tests/test_config_file.py tests/test_github.py tests/test_bitbucket_cloud_adapter.py tests/test_bitbucket_server.py tests/test_gitlab_adapter.py
• uv run pre-commit run black --all-files
• uv run pre-commit run detect-secrets --all-files
• uv run pre-commit run isort --files jf_agent/config_file_reader.py jf_agent/git/__init__.py jf_agent/git/bitbucket_cloud_adapter.py jf_agent/git/bitbucket_server.py jf_agent/git/github.py jf_agent/git/github_gql_adapter.py jf_agent/git/gitlab_adapter.py tests/test_config_file.py
• uv run pre-commit run hadolint --all-files

[rikwasmus]

Added reference to this to https://help.jellyfish.co/hc/en-us/p/feedback-portal as well.

[ashleyredzko]

Thank you for submitting this change @rikwasmus ! This looks really useful for customers with large amounts of data and who don't need such a long lookback for commits. This change looks good to me overall!

Since this is adding an additional configuration option, please add an example of this (using the default 31) to the example.yml file for other customers who might find this configuration helpful in the future.

Once that example is added we'll leave an approval and get this in for use!

Feel free to ignore the failing Endor Labs job, we're working out some kinks with that action wrt external pull requests.

[sonarqubecloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rikwasmus]

Thanks for considering @ashleyredzko
example.yaml update added to the PR.