Add test_commit_message project and run issues_bot unit tests in CI
### Problem/Motivation Include the test_commit_message project in the analysis test suite and add a dedicated CI job to execute the issues_bot unit test suite (86+ tests covering GitLab issue backend support) with JUnit reporting, making the bot test results visible and gated in the CI pipeline. ### Work items - Commit(s): [91b4d9447b](https://git.drupalcode.org/project/project_analysis/-/commit/91b4d9447b12), [01111c8175](https://git.drupalcode.org/project/project_analysis/-/commit/01111c81753b), [151f9a6300](https://git.drupalcode.org/project/project_analysis/-/commit/151f9a63007a) ### Credit - Implemented by: @bbrala --- *Filed retroactively as part of the Drupal 12 rector coverage effort. Closed as fixed; credit to be applied to the contributors listed above.* *AI was used extensively to build this work and to file this issue. See [Dries Buytaert: AI-generated Rector rules for Drupal](https://dri.es/ai-generated-rector-rules-for-drupal) and [Björn Brala: Drupal Rector rules are config, not code. Mostly.](https://www.linkedin.com/pulse/drupal-rector-rules-config-code-mostly-bj%C3%B6rn-brala-vfpwe/).*
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