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fix: add merge_group trigger to unblock merge queue

GitHub's native merge queue fires a merge_group event when processing
batched PRs. Without this trigger in workflows, no CI ran on merge
queue commits — leaving the queue stuck in AWAITING_CHECKS.

Added merge_group trigger to:
- ci-pull_request.yml (Lint, Unit Test)
- packaging.yml (Package Cloudbeat docker/tar.gz)
- unit-test.yml (Manifest Tests)
- test-opa-policies.yml (Test Rego Policies)

Also updated .mergify.yml queue_rules to replace stale check names
from the previous CI system with the correct current check names.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>