Add integration tests for CEL logic around email verified

Could you add [integrations tests](https://github.com/kubernetes/kubernetes/blob/master/test/integration/apiserver/oidc/oidc_test.go#L561) using `claims.email_verified` in
1. username.expression
2. extra[*].valueExpression
3. claimValidationRules[*].expression

_Originally posted by @aramase in https://github.com/kubernetes/kubernetes/pull/123737#discussion_r1516908029_
            