Add update-pr-branch action to update PR branch

[tkoyama010]

🚀 Pull Request

Description

The job of the action is to help click "Update branch" button for us. Designed to work with the auto-merge and "Require branches to be up to date before merging" options. It will update the newest open PR that match the below conditions

• The PR has the auto-merge option enabled
• The PR has 1 approvals and no changes-requested review
• The PR branch has no conflicts with the base branch
• The PR branch is behind the base branch

• Update PR Branch Action

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.30%. Comparing base (165afdd) to head (d51bf63).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #989 +/- ## ======================================= Coverage 91.30% 91.30% ======================================= Files 58 58 Lines 2934 2934 ======================================= Hits 2679 2679 Misses 255 255 ```

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