Unify projects search by removing /projects/:search endpoint

Removes /projects/:search endpoint (avoiding duplicated behavior with /projects?search=x).

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• Changelog entry added
• 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

Closes #22007 (closed)

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• cc24682b - Unify projects search by removing /projects/:search endpoint

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• 2e4b91e7 - Remain V3 endpoint unchanged

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• cadef802 - Remain V3 endpoint unchanged

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• e8fd6c7e - Update V3 to V4 docs

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unmarked as a Work In Progress

marked the task All builds are passing as completed

It seems like this one will make it to master before !8793 (merged), but it's not a problem actually.

@rymai Could you take a look on this and merge it if it looks good to you?

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• cdd2346d - Adjust V3 projects typo on spec

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Build is green, was a typo.

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• cdd2346d - Adjust V3 projects typo on spec

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@oswaldo Thanks, I had only a minor remark for the doc. Also, is the milestone correct? Shouldn't this be %8.17?

@rymai All the issues will stay on %9.0, since all these changes need to be on %9.0 and keeping this will improve the trackability. But not really sure if we could change all breaking change MR's to %8.17, WDYT?

assigned to @rymai

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@oswaldo Actually, this MR is not a breaking change anymore? I think the milestone should reflect the actual release where this change will go into, %8.17 in this case.

changed milestone to %8.17

removed ~728081 label

added ~480950 label

merged