Adding additional smoketests for new features

[Benjin]

Description

Adding basic E2E/smoketests for backup/restore, dacpac dialog, database management, and schema compare

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
vscode-mssql VSIX	77253 KB	6398 KB	🟢 -70855 KB ( -91% )
sql-database-projects VSIX	6174 KB	6119 KB	⚪ -55 KB ( 0% )
data-workspace VSIX	535 KB	535 KB	⚪ 0 KB ( 0% )
keymap VSIX	7 KB	7 KB	⚪ 0 KB ( 0% )

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.34%. Comparing base (7ba53ee) to head (156b11c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21790      +/-   ##
==========================================
- Coverage   73.42%   73.34%   -0.08%     
==========================================
  Files         331      323       -8     
  Lines      100234    99748     -486     
  Branches     5720     5708      -12     
==========================================
- Hits        73599    73165     -434     
+ Misses      26635    26583      -52     

see 8 files with indirect coverage changes

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