disable 2 specific firestore unit tests
disable 2 specific firestore unit tests

objc_spec doesn't crash locally on macs at the very least.
But it is crashing on github runners.
objc_integration test require a simulator and are more tricky
to setup.

firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk