Fix spec of oauth and subscription

What does this MR do and why?

Fix Pipeline https://jihulab.com/gitlab-cn/gitlab/-/pipelines/2432749

Failed Job 1

Job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12500221

Related Upstream MR: Remove oauth-login-... ID from SSO sign ups

  1) OAuth Registration provider: :cas3, additional_info: {} when block_auto_created_users is false when registering via an invitation email redirects to the activity page with all the projects/groups invitations accepted
     Got 0 failures and 2 other errors:
     1.1) Failure/Error: super
          Capybara::ElementNotFound:
            Unable to find link or button "oauth-login-cas3"
            Timeout (30s) reached while running a waiting Capybara finder.
            Consider using a non-waiting finder.

Failed Job 2

Job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12500219

Related Upstream MR: Fix symbol/string :errors/'errors' confusion in GQL client

Failures:
  1) Gitlab::SubscriptionPortal::Client#subscriptions when plan_code is only_ci_minutes behaves like when response code is 422 returns the error message along with the error_attribute_map
     Failure/Error: expect(subject[:data][:error_attribute_map]).to eq(error_attribute_map)
       expected: {:email=>["taken"]}
            got: {"email"=>["taken"]}
       (compared using ==)
       Diff:
       @@ -1 +1 @@
       -:email => ["taken"],
       +"email" => ["taken"],

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