When dropping a build with this method, it wraps the execution with
a transaction.

If this build;
- Configured as auto-retry
- Has a pipeline related to an MR
- Has a TODO with that MR
Then Ci::RetryBuildService;
- Retries the job
- Closes the TODO

And those two updates should not be in a single transaction because
they refer to different DBs.

The next step is to remove this cross-db transaction.