Make namespace owner master of project upon creation

What does this MR do?

When an admin creates a project in the namespace of a user, that user automatically gains master access to that project.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes gitlab-org/gitlab-ce#29446

added 129 commits

• 657a1edc...cc52dfab - 128 commits from branch master
• 13dfbf10 - Make namespace owner master of project upon creation

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@dbalexandre Would you mind having a look?

assigned to @dbalexandre

@to1ne Thanks! I left some notes :)

assigned to @to1ne

resolved all discussions

added 7 commits

• 13dfbf10...3c6fad64 - 6 commits from branch master
• 93f2c352 - Make namespace owner master of project upon creation

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added 1 commit

• 9f735ecd - Make namespace owner master of project upon creation

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@rymai Can you take care of the second round review please?

assigned to @rymai

@to1ne I had a few remarks, thanks!

assigned to @to1ne

resolved all discussions

marked the checklist item Changelog entry added, if necessary as completed

marked the checklist item Documentation created/updated as completed

added 111 commits

• 9f735ecd...b5526a2d - 110 commits from branch master
• 983c71a9 - Make namespace owner master of project upon creation

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marked the checklist item Conform by the merge request performance guides as completed

marked the checklist item API support added as completed

marked the checklist item Conform by the style guides as completed

marked the checklist item Branch has no merge conflicts with master (if it does - rebase it please) as completed

marked the checklist item Squashed related commits together as completed

@rymai Thx! Should be good now!

assigned to @rymai

Thanks, looks good to me!

approved this merge request

added 23 commits

• 983c71a9...025b04f3 - 22 commits from branch master
• 69f584ed - Make namespace owner master of project upon creation

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approved this merge request

enabled an automatic merge when the pipeline for 69f584ed succeeds

merged

mentioned in commit 39ff8099