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fix: add back AuthBackend which is required by custom auth backend
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Refer to a related PR or issue link (optional)
#4359
What's changed and what's your intention?
AuthBackend
error is designed to represent errors from authentication data source. It's deleted in #4359 . This patch brings it back and updated its message
Checklist
- [ ] I have written the necessary rustdoc comments.
- [ ] I have added the necessary unit tests and integration tests.
- [ ] This PR requires documentation updates.