AI PR Summary writing

[aj-codecov]

Is your feature request related to a problem? Please describe.
When an engineer opens a PR they have to write a long and descriptive summary message that is time consuming

Describe the solution you'd like
We write the PR Summary comment using the PR context we ingest for PR Review - this doubles as a clear indication the bot is working

Describe alternatives you've considered
Take no action
Add a summary to our PR review comments

Additional context
Notion