Converting tests from TypeMoq to Sinon: Batch 2

[Benjin]

Description

Converting unit tests to Sinon so we can eventually dropped the long-defunct TypeMoq library

Code Changes Checklist

• New or updated unit tests added
• All existing tests pass (npm run test)
• Code follows contributing guidelines
• Telemetry/logging updated if relevant
• No regressions or UX breakage

Reviewers: Please read our reviewer guidelines

[github-actions]

PR Changes

Category	Target Branch	PR Branch	Difference
Code Coverage	56.55%	56.22%	⚪ 0.00%
VSIX Size	4867 KB	4862 KB	⚪ -5 KB ( 0% )
Webview Bundle Size	4012 KB	4024 KB	⚪ 12 KB ( 0% )

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.30%. Comparing base (bdb7267) to head (96c3def).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20333      +/-   ##
==========================================
+ Coverage   54.22%   54.30%   +0.07%     
==========================================
  Files         198      198              
  Lines       17320    17320              
  Branches     1146     1144       -2     
==========================================
+ Hits         9392     9405      +13     
+ Misses       7928     7915      -13     

see 3 files with indirect coverage changes

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