Route: Change `#calculate_costs!` to `after_commit` callback

Use an `after_commit` instead of an `after_save`. The `after_save` could
cause intermittent problems due to Sidekiq starting before the
record/transaction actually gets committed to the database. In those
cases, the record wouldn't be found and cause an error.

With an `after_commit` callback, the record is sure to be committed
before Sidekiq takes over.

Additionally, limit the callback to `:create` and `:update` because
otherwise it will be active on `:destroy` by default also. This work
isn't relevant on destroy, so don't do it then.

Update the tests:

* Update labels
* Use `build` instead of `create` because we're saving the record at the
  end anyway so we don't need an object that starts out persisted
* Use `truncation: true` for these tests because otherwise the `commit`
  callback doesn't get called due to transactional teardown

Refs #6407

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