Enable switching when only one endpoint is selected

[lewis-sanchez]

Pull Request Template – vscode-mssql

Description

This PR allows Schema Compare endpoints to switch when only one endpoint is selected.

Switching when two endpoints are selected works just like before:

Provide a clear, concise summary of the changes in this PR. What problem does it solve? Why is it needed? Link any related issues using issue closing keywords.

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	5282 KB	5282 KB	⚪ 0 KB ( 0% )
sql-database-projects VSIX	5668 KB	5668 KB	⚪ 0 KB ( 0% )

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.87%. Comparing base (4085e9d) to head (03f6fbd).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/schemaCompare/schemaCompareWebViewController.ts	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20796      +/-   ##
==========================================
+ Coverage   65.86%   65.87%   +0.01%     
==========================================
  Files         210      210              
  Lines       19968    19974       +6     
  Branches     2589     2593       +4     
==========================================
+ Hits        13152    13158       +6     
  Misses       6718     6718              
  Partials       98       98              

Files with missing lines	Coverage Δ
...rc/schemaCompare/schemaCompareWebViewController.ts	58.75% <75.00%> (+0.28%)	⬆️

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