Update URLs in spec/factories to use .test instead of .org

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https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32259 fixed the immediate failing specs on master, but as pointed out in the discussion bellow, this failure can occure again. We should take of of other places where the issue can potentially occur. Using .test instead of .org sounds like a good step, we can decide then if futher steps are needed

The following discussion from gitlab-ce!32259 should be addressed:

• @engwan started a discussion: (+1 comment)

  These are the ones that I see failed in master. I see that a lot more specs have WebMock.stub_request though.

  I think those don't fail yet because the generated webhook URLs don't resolve to an IP (These are generated from a sequence in the factory). We should fix those in a future MR.

  Maybe an easy fix would be to generate URLs in the factories that have lesser chances of being real domains. I feel like using stub_full_request would be the proper fix though.