e2e

fix(firestore): revert breaking change to where() API. `null` cannot … #4

Job	Run time
android (tests)	22m 31s
android (packages/cloud_firestore/cloud_firestore/example)	22m 50s
ios (tests)	22m 16s
macos (tests)	17m 28s
ios (packages/cloud_firestore/cloud_firestore/example)	13m 45s
web (tests)	4m 33s
macos (packages/cloud_firestore/cloud_firestore/example)	8m 50s
web (packages/cloud_firestore/cloud_firestore/example)	6m 3s
windows	9m 52s
	2h 8m 8s

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