Improve error logging for FIRAuthInternalErrorCodeUnexpectedErrorResponse errors

[rosalyntan]

Add NSUnderlyingError to FIRAuthInternalErrorCodeUnexpectedErrorResponse errors.

[google-oss-bot]

Binary Size Report

Affected SDKs

• FirebaseAuth

  Type	Base (f243335)	Head (728367e)	Diff
  firebase-ios-sdk	?	1.03 MB	? (?)

Test Logs

• Head (728367e9): https://github.com/firebase/firebase-ios-sdk/actions/runs/1271805667

[google-oss-bot]

Coverage Report

Affected SDKs

• FirebaseAuth-iOS-FirebaseAuth.framework

  SDK overall coverage changed from 68.25% (f243335) to 68.29% (728367e) by +0.04%.

  Filename	Base (f243335)	Head (728367e)	Diff
  FIRAuthBackend.m	85.01%	85.07%	+0.06%
  FIRAuthErrorUtils.m	74.43%	74.82%	+0.40%

Test Logs

• Base (f243335a): https://github.com/firebase/firebase-ios-sdk/actions/runs/1270352153
• Head (728367e9): https://github.com/firebase/firebase-ios-sdk/actions/runs/1271805667

[maksymmalyhin]

LGTM.

A question. Is the additional info expected to be used by the developers? If yes, it may be worth mentioning the available userInfo keys in the public API docs for better discoverability.

[rosalyntan]

A question. Is the additional info expected to be used by the developers? If yes, it may be worth mentioning the available userInfo keys in the public API docs for better discoverability.

Ack, the FIRAuthInternalErrorCodeUnexepectedErrorResponse error code is wrapped inside the FIRAuthErrorCodeInternalError public error code, which is presented with the message "An internal error has occurred, print and inspect the error details for more information."