install fish completions in vendor folder #18979
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What does this PR do?
Picking up #17984
Fixes: #17855
Adds new folders for the default fish completions path, it now tries to get the fish vendor folder from pkg-config, if that fails it tries the default vendor folder and if that fails it falls back to the other already implemented folder lookup
How did you verify your code works?
Built locally and ran the command, seems to be working fine, couldn't find automated tests for this so I'm assuming this is fine (?)