Release version: v/e5.8.0

Summary

Prior to this fix, if a authenticator is failed to get initialized when node boots up, it will be displayed on dashboard in "disconnected" state.
But when we try to delete it from dashboard, a "not found" error is returned.

This is because although the config exists, it was not actually added to the chain (failed to init).
After this fix, the deletion in from the chain is made idempotent, i.e. allow delete even if it's not on the chain already.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Added property-based tests for code which performs user input validation
• Changed lines covered in coverage report
• Change log has been added to changes/(ce|ee)/(feat|perf|fix|breaking)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• Created PR to emqx-docs if documentation update is required, or link to a follow-up jira ticket
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update