fix(search-mr): Fix the searchMergeRequestByUrl function to handle /-/ in the URL

[M0nkeySan]

The mergeRequestfixture was incorrect, the URL of a MR is build like this :

http://gitlab.example.com/my-group/my-project/-/merge_requests/1 instead of http://gitlab.example.com/my-group/my-project/merge_requests/1

I fixed the retrievement of the projectPath to handle the additional /-/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.40%. Comparing base (f470aaa) to head (2571bf8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   78.40%   78.40%           
=======================================
  Files          94       94           
  Lines        1922     1922           
  Branches      347      347           
=======================================
  Hits         1507     1507           
  Misses        387      387           
  Partials       28       28           

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