test(app-check, web): move to its own job to stop throttling of other e2e tests #5446

Job	Run time
android (tests)	7m 18s
web (tests)	4m 43s
ios (tests)	38m 17s
android (packages/cloud_firestore/cloud_firestore/example)	6m 53s
web (packages/cloud_firestore/cloud_firestore/example)	6m 33s
macos (tests)	7m 56s
ios (packages/cloud_firestore/cloud_firestore/example)	10m 9s
macos (packages/cloud_firestore/cloud_firestore/example)	6m 22s
web-app-check	5m 21s
web-wasm (tests)	2m 39s
windows	8m 47s
windows-firestore	7m 58s
web-wasm (packages/cloud_firestore/cloud_firestore/example)	4m 42s
	1h 57m 38s

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