Release 13.1.0

[iangmaia]

Releasing new version 13.1.0.

What's Next

PR Author: Be sure to create and publish a GitHub Release pointing to trunk once this PR gets merged,
copy/pasting the following text as the GitHub Release's description:

### New Features

- Make fastlane log actions as collapsible groups in Buildkite. [#638]
- Add `api_url` parameter to `create_release_backmerge_pull_request` to support GitHub Enterprise. Also, updated the code so the intermediate branch tracks its remote branch after pushing. [#641]

### Bug Fixes

- Fix issue in `create_release_backmerge_pull_request` where calling another fastlane action from the `intermediate_branch_created_callback` proc now behaves correctly. [#641]
- Fix an issue where `prototype_build_details_comment` added some unexpected metadata rows in the comment table if we didn't use `firebase_app_distribution` (e.g. for Prototype Builds uploaded to S3 and not using FAD) [#642]