feat: log-merge-group-failure

[itsyoboieltr]

This PR creates a new reusable workflow that will be used to write data to google sheets when the merge group event fails. A reusable workflow is preferred, so that mobile and extension can make use of the same implementation. Environment variables (= GitHub secrets) are required to configure:

• GOOGLE_APPLICATION_CREDENTIALS, GOOGLE_SERVICE_ACCOUNT: The google service account that is used for authentication with the google sheets api.
  • The service account needs to have access to the google sheet you intend to operate on. To give access to the google sheet, you need to click the "Share" button in the top-right corner. Enter the service account's email (can be found on google cloud console), give "Editor" permissions. After this, the service account will have access to this spreadsheet, allowing read and write operations.
• SPREADSHEET_ID: unique identifier that can be found in the url when you open the google sheet
• SHEET_NAME: name of a sheet in a spreadsheet that can be found on the bottom

Short summary of what happens in the workflow:

1. Google api authentication setup
2. Check if current date exists in the spreadsheet
3. If current date exists, increment number of PRs by 1
4. If current date does not exist, create a new row with the current date, and the number 1 (so that it can be incremented later, if more merge group events fail on the same day).

Spreadsheet here: https://docs.google.com/spreadsheets/d/11niHgT_E2YzzXHXQSxX5LNdA6i0GG5aa-OZWvn7_-o4

Dashboard here: https://lookerstudio.google.com/u/1/reporting/e7e8f90e-72aa-4128-ae01-6305bf3393f4/page/p_pz1dszarmd

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/3400

[danjm]

LGTM