ci: create release PRs with daytonaBot token

[aprojic]

Release automation opens PRs with the default GITHUB_TOKEN. PRs created that way never trigger pull_request workflows, so release PRs get no CI, and it blocks disabling the repo setting "Allow GitHub Actions to create and approve pull requests".

This switches gh pr create in prepare-release and release (sync_gosum) to GITHUBBOT_TOKEN (daytonaBot) via GH_TOKEN. Branch pushes and tag pushes stay on GITHUB_TOKEN. daytonaBot is added to the CLA allowlist so its PRs pass the gate.

To confirm before merge: the GITHUBBOT_TOKEN PAT must cover daytona/clients (PR create). Today it is only exercised against daytonaio/homebrew-cli, so if it is a fine-grained PAT scoped to that repo it needs daytona/clients added.

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Summary by cubic

Release PRs are now opened with the daytonaBot token via GH_TOKEN so pull_request workflows run, and we fail fast if GITHUBBOT_TOKEN is missing to avoid CI‑less PRs. daytonaBot is added to the CLA allowlist; branch/tag pushes still use GITHUB_TOKEN.

• Migration
  • Ensure GITHUBBOT_TOKEN has PR scope for daytona/clients.

^{Written for commit 96b3fad. Summary will update on new commits.}

[github-actions]

All contributors have signed the CLA. ✅ Thank you!
_{Posted by the CLA Assistant Lite bot.}

[aprojic]

I have read the CLA Document and I hereby sign the CLA

[cubic-dev-ai]

All reported issues were addressed across 3 files

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[aprojic]

recheck

[cubic-dev-ai]

All reported issues were addressed across 2 files (changes from recent commits).

_{You’re at about 96% of the monthly reviewed-line limit. You may want to disable incremental reviews to conserve quota. Reviews will continue until that limit is exceeded. If you need help avoiding interruptions, please contact contact@cubic.dev.}

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>