Add member: Always return 409 when a member exists
What does this MR do?
It always returns 409 status when a member exists for a source (201 was returned for project).
Why was this MR needed?
It helps consistency in api
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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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?
Fixes #20732 (closed)