Create error handling system

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In contributors, we tend to let the errors bubble up instead of handling them. We should brainstorm and create a error handling system so they are handled consistently and with good UX. Please drop ideas here 🙂

A recent specific example where we should handle errors:

• In app/javascript/pages/manage-issue-page/CloseAction.vue if we don't get a success response back from the API

Recreation steps

Implementation plan

/cc @gitlab-org/developer-relations/contributor-success