Update Xcode versions
What does this MR do?
- Update Xcode 12 to 12.2
- Update Xcode 11 to 11.7
- Remove other versions from the 11 branch (11, 11.1, 11.2, 11.3.1, 11.4.1, 11.5, 11.6)
Why was this MR needed?
Customer request to have Xcode 11.7 https://gitlab.com/gitlab-com/macos-buildcloud-runners-beta/-/issues/36#note_460667221
Also, this speeds up our pipeline considerably and reduces our image storage (we're currently working with limited quota)
What's the best way to test this MR?
What are the relevant issue numbers?
Edited by Adrien Kohlbecker