feat: add UI support for flag metadata #14490

Job	Run time
CLI Integration Tests	1m 59s
UI Integration Tests	2m 2s
Integration Tests (api/sqlite)	2m 18s
Integration Tests (api/libsql)	2m 8s
Integration Tests (api/postgres)	1m 59s
Integration Tests (api/mysql)	2m 4s
Integration Tests (api/cockroach)	2m 7s
Integration Tests (api/cache)	2m 8s
Integration Tests (api/cachetls)	2m 6s
Integration Tests (api/snapshot)	1m 56s
Integration Tests (api/ofrep)	2m 1s
Integration Tests (fs/git)	2m 9s
Integration Tests (fs/local)	2m 1s
Integration Tests (fs/s3)	2m 3s
Integration Tests (fs/oci)	1m 59s
Integration Tests (fs/azblob)	2m 0s
Integration Tests (fs/gcs)	2m 5s
Integration Tests (import/export)	1m 59s
Integration Tests (authn)	2m 4s
Integration Tests (authz)	2m 3s
Integration Tests (audit/webhook)	2m 3s
Integration Tests (audit/webhooktmpl)	2m 0s
	45m 14s

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