chore(ci): remove merge queue automation

[tay1orjones]

Based on the response in my support ticket, adding PRs to the merge queue via the gh cli in a workflow automation is broken and there's no timing on a fix.

It's a mixture of:

• https://github.com/cli/cli/issues/7143
• https://github.com/cli/cli/issues/7213
• https://github.com/cli/cli/issues/8352

All of which are grounded in API issues GitHub has yet to fix to my knowledge.

In the meantime, if someone's interested in refactoring this, it should be possible to manually envoke the API. I'm just not going to dive into that right now. Response from support:

You can add PRs to the merge queue using the enqueuepullrequest GraphQL mutation, for example:

mutation {
  enqueuePullRequest(input: {clientMutationId: "uniqueID1234", pullRequestId: "<PR_ID>"}) {
    clientMutationId
    mergeQueueEntry {
      enqueuedAt
      estimatedTimeToMerge
      mergeQueue {
        url
      }
      state
    }
  }
}

The above example returns only some of the available return fields. See the full list here.

You can get the PR ID from the ${{ github.event.pull_request.node_id }} env variable. (See example here).

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