Add feature specs for group/project creation with active integration

What does this MR do and why?

This MR adds 2 feature specs that test creation of a project and a group while having a default active instance integration. This is done in order to fill the testing gap we've experienced when a new not null constraint on integrations table caused a staging incident while on the MR level all tests were green https://gitlab.com/gitlab-com/gl-infra/production/-/issues/20126 With this change - we should be able to catch it in the future.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/554084

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