fix(a11y): Remove placeholders in `DateInput` #4583

Job	Run time
Check file changes	5s
Build React App	4m 4s
Run Integration tests	5m 17s
Run API Tests	0s
Run React Tests	5m 19s
E2E tests	10m 0s
Generate Hasura Change Summary	0s
Upsert Vultr Instance	3m 5s
Run Pulumi Preview	0s
Run Healthcheck on Pizza Services	1m 42s
	29m 32s

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