[Auth] Add objc attribute to UserInfoImpl so legacy decoding works #14169
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The class names was changed from
FIRUserInfoImpltoUserInfoImpl, but the unarchiving older copies (pre name change) requires knowing the original ObjC name. The rest of the direct/transitive types from theUserclass'sinit?(coder:)look okay.We actually do this for other classes, I just had to make the connection that the class wasn't being decoded because the pre-11 archive didn't have a blob mapping to "UserInfoImpl". The blob was mapping to "FIRUserInfoImpl".
firebase-ios-sdk/FirebaseAuth/Sources/Swift/SystemService/AuthAppCredential.swift
Lines 18 to 19 in 700fd68
Fix #14011