refactor: merge and fail check run messages

[zolamk]

Description

Adjusts the $merge and $failCheckStatus built-in check run messages to make it a bit more clear to the user.

Summary generated by Reviewpad on 22 May 23 07:24 UTC

This pull request contains two refactor patches. The first patch removes the policy from the check run title, while the second patch changes the check run summary if Reviewpad fails to merge.

🤖 Generated by Copilot at 0c8d532

Refactor and simplify aladino plugin actions. Extract common code for check run updates to a helper function. Improve error handling and output titles.

Code review and merge strategy

Ship: this pull request can be automatically merged and does not require code review

How

🤖 Generated by Copilot at 0c8d532

• Simplify check run output title for reviewpad plugin (link)
• Refactor code to update check run status and output before merging pull request using a helper function updateCheckRunWithSummary (link, link)
• Handle merge failure due to branch protection rules and update check run status and output accordingly (link)
• Remove unused variable assignment in merge.go (link)

[reviewpad]

Pull request is in ship mode. Reviewpad will merge it.