@W-21933885: [MSDK Android] App Attestation Implementation (Add additionalOauthKeys Stub To TokenMigrationActivityTest)

The Firebase Test Lab failure in onCreate_withNullFrontDoorUrl_callsErrorCallbackAndFinishes was caused by missing stub for getAdditionalOauthKeys(). This method is called during UserAccountManager.buildUserAccount() when the lifecycle triggers getCurrentUser() during onResume().

Changes:
- Added stub for additionalOauthKeys property returning emptyList() (line 131)
- This prevents MockKException when the method is called during user account building

The stub returns an empty list since no additional OAuth keys are needed for these test scenarios.

Author: JohnsonEricAtSalesforce

libs/test/SalesforceSDKTest/src/com/salesforce/androidsdk/ui/TokenMigrationActivityTest.kt

@@ -127,6 +127,9 @@ class TokenMigrationActivityTest {
         // Mock userAccountManager (called during lifecycle for biometric auth checks)
         every { SalesforceSDKManager.getInstance().userAccountManager } returns mockUserAccountManager
 
+        // Mock additionalOauthKeys (called during user account building in lifecycle)
+        every { SalesforceSDKManager.getInstance().additionalOauthKeys } returns emptyList()
+
         // CRITICAL: Mock appAttestationClient to return null to prevent blocking network calls
         // in LoginViewModel.getAuthorizationUrl() and OAuth2.makeTokenEndpointRequest()
         every { SalesforceSDKManager.getInstance().appAttestationClient } returns null