feat: re-enable legacy client IDs #1555

Job	Run time
Run OIDC conformity tests	11m 44s
Generate SDKs	1m 55s
Run end-to-end tests (memory)	7m 10s
Run end-to-end tests (memory, --jwt)	6m 46s
Run end-to-end tests (postgres)	7m 10s
Run end-to-end tests (postgres, --jwt)	6m 58s
Run end-to-end tests (mysql)	7m 13s
Run end-to-end tests (mysql, --jwt)	7m 32s
Run end-to-end tests (cockroach)	7m 48s
Run end-to-end tests (cockroach, --jwt)	7m 41s
Run HSM tests	10m 12s
Run tests and lints	17m 46s
Build CLI docs	1m 28s
Generate changelog	0s
Generate release	0s
Render version schema	0s
Release SDKs	0s
Draft newsletter	0s
Send newsletter	0s
Pending approval Slack notification	0s
	1h 41m 23s

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