Bitbucket DC: resolve annotated tag SHA to commit SHA before posting build status

[dccdis]

Fixes #6202

[qwerty287]

Thanks! The sha is also cloneable? Because cloning uses the sha by default.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.60%. Comparing base (739114b) to head (5c49ee3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...r/forge/bitbucketdatacenter/bitbucketdatacenter.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6203      +/-   ##
==========================================
+ Coverage   32.58%   32.60%   +0.01%     
==========================================
  Files         417      417              
  Lines       28096    28100       +4     
==========================================
+ Hits         9156     9161       +5     
+ Misses      18094    18093       -1     
  Partials      846      846              

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[dccdis]

As far as I can tell the bug only affects status reporting. Otherwise the pipeline appears to work perfectly (code clones, runs, passes/fails) both before and after applying the proposed fix.