Improve UX for displayed CODEOWNERS errors (Frontend)
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This is the frontend component to #517967
It will be beneficial for a better UX that we display extra information for some type of errors i.e INVALID_SECTION_OWNER_FORMAT: Inaccessible owners, MALFORMED_ENTRY_OWNER: Malformed owners and OWNER_WITHOUT_PERMISSION: Owners without permission.
NB: There may be other errors here that may benefit from this
Proposal
We could enhance error reporting by extending Gitlab::CodeOwners::Error to return details about a line entry error. Adding a details field to that class (i.e., Error.new(message: :malformed_entry_owner, line_number: 5, path: path, details: malformed_owner)) would allow us to display more informative messages to the Frontend i.e Line 5: malformed_owner.
Current Look:
