Update claims instead of overwrite from webhook response #2031

Job	Run time
Run OIDC conformity tests	11m 14s
Generate SDKs	3m 39s
Run tests and lints	7m 48s
Run end-to-end tests (memory)	5m 3s
Run HSM tests	5m 48s
Run end-to-end tests (memory, --jwt)	5m 24s
Run end-to-end tests (postgres)	4m 50s
Run end-to-end tests (postgres, --jwt)	5m 19s
Run end-to-end tests (mysql)	5m 11s
Run end-to-end tests (mysql, --jwt)	5m 14s
Run end-to-end tests (cockroach)	5m 47s
Run end-to-end tests (cockroach, --jwt)	5m 33s
Generate changelog	0s
Build CLI docs	0s
Generate release	0s
Render version schema	0s
Release SDKs	0s
Draft newsletter	0s
Send newsletter	0s
Pending approval Slack notification	0s
	1h 10m 50s

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