Update error message for unexpected auth errors

[jloh02]

Context

"Unexpected error occurred" message occurs when login via NUS using email passes but no relayState given by NUS API

Implementation

Return additional info by overriding defaultRescue handler

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
nusmods-export	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 3:08pm
nusmods-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 3:08pm

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.86%. Comparing base (2d4743d) to head (aa059c2). Report is 38 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3836 +/- ## ========================================== + Coverage 53.87% 54.86% +0.98% ========================================== Files 274 274 Lines 6032 6066 +34 Branches 1449 1453 +4 ========================================== + Hits 3250 3328 +78 + Misses 2782 2738 -44 ```

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