fix(worker): Handle newline normalization at boundary of streamed chunks

[nellh]

When normalizing newlines during git edits we could fail to handle newline edits at the boundaries of the chunk or if none appeared in the first chunk. Add coverage for this normalization.

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 45.48%. Comparing base (3e69eac) to head (fe22d16).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
services/datalad/datalad_service/common/git.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3838      +/-   ##
==========================================
+ Coverage   45.40%   45.48%   +0.07%     
==========================================
  Files         650      650              
  Lines       34957    34969      +12     
  Branches     1711     1711              
==========================================
+ Hits        15873    15904      +31     
+ Misses      18902    18883      -19     
  Partials      182      182              

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[codecov]

Bundle Report

Bundle size has no change ✅