Fix import issues in SFRT test files and finalize comprehensive test suite

Co-authored-by: gagandeepghai <[email protected]>

Author: Copilot

IdentityCore/tests/MSIDFamilyRefreshTokenTests.m

@@ -28,6 +28,7 @@
 #import "MSIDTestIdentifiers.h"
 #import "MSIDCredentialCacheItem.h"
 #import "MSIDCredentialType.h"
+#import "MSIDAccessToken.h"
 
 @interface MSIDFamilyRefreshTokenTests : XCTestCase