sources/oauth: add gitlab type [AUTH-323] #18262

Job	Run time
lint (bandit)	1m 52s
lint (black)	2m 5s
lint (codespell)	1m 32s
lint (pending-migrations)	1m 48s
test-migrations	2m 3s
lint (ruff)	1m 24s
test-integration	4m 6s
test-migrations-from-stable - PostgreSQL 12-alpine	13m 35s
test-migrations-from-stable - PostgreSQL 15-alpine	13m 49s
test-migrations-from-stable - PostgreSQL 16-alpine	13m 18s
test-unittest - PostgreSQL 12-alpine	13m 1s
test-unittest - PostgreSQL 15-alpine	13m 51s
test-unittest - PostgreSQL 16-alpine	12m 41s
test-e2e (proxy)	7m 13s
test-e2e (oauth)	8m 58s
test-e2e (oauth-oidc)	7m 43s
test-e2e (saml)	8m 5s
test-e2e (ldap)	11m 5s
test-e2e (radius)	6m 48s
test-e2e (flows)	6m 51s
ci-core-mark	1s
build (amd64)	7m 25s
build (arm64)	18m 8s
pr-comment	5s
	2h 57m 27s

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