Bitbucket: Fix parsing /user/workspaces response

[lephuongbg]

Fixes #6362

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.45%. Comparing base (ff71578) to head (42d1105).
⚠️ Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
server/forge/bitbucket/bitbucket.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6396      +/-   ##
==========================================
+ Coverage   34.17%   35.45%   +1.27%     
==========================================
  Files         426      427       +1     
  Lines       28541    28646     +105     
==========================================
+ Hits         9755    10156     +401     
+ Misses      17898    17561     -337     
- Partials      888      929      +41     

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