Only run actions dependency-review-action if running in a PR action. This broke when run as part of action for commit on main and on a preview branch: - https://github.com/zed-industries/zed/actions/runs/12793068921/job/35664998296 - https://github.com/zed-industries/zed/actions/runs/12793045639 Originally introduced in: - https://github.com/zed-industries/zed/pull/21424 But was only tested with `merge_group` which has since been reverted.