ci: delete redundant bot-branch-delete workflow; make cleanup explicit

[tablackburn]

Summary

Applies the same fix merged in SrrDBAutomationToolkit#29 to this repo.

• Add --delete-branch to both gh pr merge --auto --squash calls in
  auto-merge-bots.yml, so bot PR head branches are deleted explicitly at
  merge time (author-independent, in-code).
• Remove the redundant delete-merged-bot-branches.yml on-close workflow.
  It fired on pull_request: closed and re-deleted a branch that was already
  gone, racing merge-time cleanup and only ever failing with
  Reference does not exist.

Breaking Changes

None.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: be88364d-d5f3-4ff6-b285-bfc8b09343b2

📥 Commits

Reviewing files that changed from the base of the PR and between 5ce80ac and 9bc70c6.

📒 Files selected for processing (2)

• .github/workflows/auto-merge-bots.yml
• .github/workflows/delete-merged-bot-branches.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/explicit-bot-branch-cleanup

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[Copilot]

Pull request overview

This PR updates the repository’s GitHub Actions automation for bot-driven pull requests by ensuring bot PR head branches are deleted explicitly at merge time, and by removing a redundant post-close cleanup workflow that could race and fail once branches are already gone.

Changes:

• Add --delete-branch to the gh pr merge --auto --squash steps in auto-merge-bots.yml (Dependabot + pre-commit-ci).
• Remove the delete-merged-bot-branches.yml workflow that deleted bot branches on pull_request: closed.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/auto-merge-bots.yml	Ensures bot PR branches are deleted via the merge command itself (--delete-branch).
.github/workflows/delete-merged-bot-branches.yml	Removes redundant branch-deletion workflow that could fail after the branch is already deleted.

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