Improve “fetching approval rules” error message
The error message displayed when the system is unable to fetch the approval rules (from the project settings or from the merge request), is not very helpful. It also is placed at the top of the MR form, making it look like a global error, when it actually is a local error — so it should probably be embedded in the approval rules fieldset.
The message is currently defined in https://gitlab.com/gitlab-org/gitlab/-/blob/04a6005789fa981a19c2b40fd08cd6c1459fcd51/ee/app/assets/javascripts/approvals/stores/modules/mr_edit/actions.js#L61 and looks like this: