fix: allowing empty diffs in scanDiff

[fabiovincenzi]

Fixes #1008 - scanDiff now properly handles force pushes after rebases by allowing legitimate empty diffs instead of blocking them.

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	35e88fa
🔍 Latest deploy log	https://app.netlify.com/projects/endearing-brigadeiros-63f9d0/deploys/68c143c863675900080f3250

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.71%. Comparing base (c530aac) to head (35e88fa).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1182      +/-   ##
==========================================
+ Coverage   83.67%   83.71%   +0.03%     
==========================================
  Files          67       67              
  Lines        2886     2886              
  Branches      365      365              
==========================================
+ Hits         2415     2416       +1     
  Misses        410      410              
+ Partials       61       60       -1     

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[kriswest]

Little confused about the test expecting two different possible outputs (block and non-block).

Test files could be moved into the /test/processors folder.

[kriswest]

LGTM