chore(page): Drop `"PAGE"` feature flag #5988

Job	Run time
Check file changes	4s
Run React Tests	5m 18s
Build React App	3m 35s
Run Integration tests	5m 20s
Run API Tests	0s
E2E tests	9m 29s
Generate Hasura Change Summary	0s
Upsert Vultr Instance	2m 33s
Run Pulumi Preview	0s
Run Healthcheck on Pizza Services	32s
	26m 51s

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