fix: add PKCE config key to config schema #4756

Job	Run time
Generate SDKs	3m 29s
Run end-to-end tests (postgres)	43m 8s
Run tests and lints	28m 11s
Run Playwright end-to-end tests (postgres)	5m 15s
Run Playwright end-to-end tests (cockroach)	5m 43s
Run end-to-end tests (cockroach)	47m 7s
Run end-to-end tests (sqlite)	44m 13s
Run end-to-end tests (mysql)	44m 11s
Run Playwright end-to-end tests (sqlite)	5m 27s
Run Playwright end-to-end tests (mysql)	5m 22s
Build CLI docs	1m 10s
Generate changelog	0s
Generate release	0s
Render version schema	0s
Draft newsletter	0s
Release SDKs	0s
Send newsletter	0s
Pending approval Slack notification	0s
	3h 53m 16s

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