Dequarantine dependency proxy group SSO SAML e2e test

What does this MR do and why?

This test only recently started running on staging and staging-ref. It was previously skipped on .com/SaaS environments due to using a global feature flag. The FF was removed in this commit.

Since this test is using Group SAML SSO, it either should be disabled on a SaaS environment or the test should include steps to enable premium license on the group since Group SAML SSO is a premium feature.

By default, any tests with the :orchestrated meta are skipped on SaaS environment but the qa-browser_ui-5_package is explicitly passing --tag orchestrated

(context)

MR acceptance checklist

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