AIRO-618 Activating more Yamato features

[mrpropellers]

Proposed change(s)

Previously we only tested PRs pre-merge, but those checks don't show up in our commit history, which is very useful to have when looking for breaks in dev or main's history. This PR changes the trigger logic to execute post-merge as well. This change also adds an error message when the code coverage check fails

Useful links (GitHub issues, JIRA tickets, forum threads, etc.)

https://jira.unity3d.com/browse/AIRO-620 https://jira.unity3d.com/browse/AIRO-618

Types of change(s)

• [x] Other (please describe)

Testing and Verification

Ironically this can't be tested without merging it to dev.

Checklist

• [x] Ensured this PR is up-to-date with the dev branch
• [x] Created this PR to target the dev branch
• [x] Followed the style guidelines as described in the Contribution Guidelines
• [ ] Updated the Changelog and described changes in the Unreleased section