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: 1e56608f-16fe-4b12-9609-94c73e632510

📥 Commits

Reviewing files that changed from the base of the PR and between ff1429c and f380243.

📒 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 simplifies bot-PR branch cleanup by deleting bot head branches explicitly at merge time and removing a redundant post-close cleanup workflow that could race and fail after the branch was already removed.

Changes:

• Add --delete-branch to the gh pr merge --auto --squash commands for Dependabot and pre-commit.ci PRs.
• Remove the pull_request: closed workflow that attempted to delete already-merged bot branches.

Reviewed changes

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

File	Description
.github/workflows/delete-merged-bot-branches.yml	Removes redundant post-close branch deletion job for bot PRs.
.github/workflows/auto-merge-bots.yml	Deletes bot PR head branches as part of the merge configuration via gh pr merge --delete-branch.

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