Remove two flaky secure tests from reliable

What does this MR do and why?

Describe in detail what your merge request does and why.

Removes two secure tests that showed a lot of flakiness over the past week from reliable. This is based on Reliable e2e test report, and also failed executions reports for review-qa-reliable - merge_request_license_widget_spec and create_merge_request_with_secure_spec.

Even though there are significant runner improvements being made in https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1372, there are still new failures coming in (less than 24hr ago on master - https://gitlab.com/gitlab-org/gitlab/-/jobs/2644715415, also new failures on Preprod - #366298 (closed)) so we are removing the tests from reliable for now till they are proven to be stable again.

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