Normalizing asserts to fluent-style expect

[Benjin]

Pull Request Template – vscode-mssql

Description

Moving all remaining asserts to fluent-style expect(x).to.be(y) where possible.

TODO:

• add warning rule when attempting to import assert 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	58.83%	58.83%	⚪ 0.00%
VSIX Size	5209 KB	5209 KB	⚪ 0 KB ( 0% )
Webview Bundle Size	5216 KB	5216 KB	⚪ 0 KB ( 0% )

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.76%. Comparing base (0932470) to head (096e999).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20490   +/-   ##
=======================================
  Coverage   56.76%   56.76%           
=======================================
  Files         205      205           
  Lines       18369    18369           
  Branches     1164     1164           
=======================================
  Hits        10428    10428           
  Misses       7941     7941           

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