feat: store client in challenge/verified and reduce DB load #2002

Job	Run time
Run OIDC conformity tests	6m 19s
Generate SDKs	3m 36s
Run end-to-end tests (memory)	2m 40s
Run HSM tests	2m 39s
Run tests and lints	1m 47s
Run end-to-end tests (memory, --jwt)	2m 39s
Run end-to-end tests (postgres)	2m 39s
Run end-to-end tests (postgres, --jwt)	2m 38s
Run end-to-end tests (mysql)	2m 38s
Run end-to-end tests (mysql, --jwt)	2m 40s
Run end-to-end tests (cockroach)	2m 39s
Run end-to-end tests (cockroach, --jwt)	2m 39s
Build CLI docs	0s
Generate changelog	1s
Generate release	1s
Render version schema	1s
Draft newsletter	1s
Release SDKs	1s
Pending approval Slack notification	1s
Send newsletter	1s
	35m 40s

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