Remove unused 3P source from RTDB tests (#9217)

Author: paulb777

FirebaseDatabase.podspec

@@ -63,7 +63,6 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
       'FirebaseDatabase/Tests/Unit/*.[mh]',
       'FirebaseDatabase/Tests/Unit/Swift/*',
       'FirebaseDatabase/Tests/Helpers/*.[mh]',
-      'FirebaseDatabase/Tests/third_party/*.[mh]',
       'SharedTestUtilities/AppCheckFake/*.[mh]',
       'SharedTestUtilities/FIRAuthInteropFake.[mh]',
       'SharedTestUtilities/FIRComponentTestUtilities.[mh]',

FirebaseDatabase/Tests/Helpers/FTestAuthTokenGenerator.h

@@ -17,7 +17,6 @@
 #import "FirebaseCore/Sources/Private/FirebaseCoreInternal.h"
 
 #import "FirebaseDatabase/Sources/Api/Private/FIRDatabaseQuery_Private.h"
-#import "FirebaseDatabase/Tests/Helpers/FTestAuthTokenGenerator.h"
 #import "FirebaseDatabase/Tests/Helpers/FTestBase.h"
 #import "SharedTestUtilities/FIROptionsMock.h"
 

FirebaseDatabase/Tests/Helpers/FTestAuthTokenGenerator.m

@@ -22,7 +22,6 @@
 #import "FirebaseDatabase/Sources/Api/Private/FIRDatabase_Private.h"
 #import "FirebaseDatabase/Sources/Constants/FConstants.h"
 #import "FirebaseDatabase/Sources/FIRDatabaseConfig_Private.h"
-#import "FirebaseDatabase/Tests/Helpers/FTestAuthTokenGenerator.h"
 
 #import "SharedTestUtilities/AppCheckFake/FIRAppCheckFake.h"
 #import "SharedTestUtilities/AppCheckFake/FIRAppCheckTokenResultFake.h"

FirebaseDatabase/Tests/Helpers/FTestBase.m

@@ -20,7 +20,6 @@
 #import "Interop/Auth/Public/FIRAuthInterop.h"
 
 #import "FirebaseDatabase/Sources/FIRDatabaseConfig_Private.h"
-#import "FirebaseDatabase/Tests/Helpers/FTestAuthTokenGenerator.h"
 #import "FirebaseDatabase/Tests/Helpers/FTestBase.h"
 #import "FirebaseDatabase/Tests/Helpers/FTestHelpers.h"