chore(page): Drop `"PAGE"` feature flag #5927

Job	Run time
Check file changes	3s
Build React App	4m 17s
Run Integration tests	5m 33s
Run React Tests	6m 18s
Run API Tests	0s
E2E tests	10m 32s
Generate Hasura Change Summary	0s
Upsert Vultr Instance	21m 23s
Run Pulumi Preview	0s
Run Healthcheck on Pizza Services	33s
	48m 39s

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