Adding actionable message banners and clear token cache button

[Benjin]

Pull Request Template – vscode-mssql

Description

• Adds a button to clear the token cache if a multiple_matching_tokens error is detected.
• Adds the ability to add action buttons and specify intent (error/warning/success/info) for messages.

Fixes #19733

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	55.79%	56.06%	⚪ 0.00%
VSIX Size	4856 KB	4862 KB	⚪ 6 KB ( 0% )
Webview Bundle Size	4008 KB	4024 KB	⚪ 16 KB ( 0% )

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.14%. Comparing base (d14ec84) to head (1bfa56a).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...nectionconfig/connectionDialogWebviewController.ts	55.88%	15 Missing ⚠️
src/connectionconfig/azureHelpers.ts	0.00%	3 Missing ⚠️
src/controllers/connectionManager.ts	0.00%	2 Missing ⚠️
src/controllers/mainController.ts	0.00%	2 Missing ⚠️
src/languageservice/serviceclient.ts	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (50.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20305      +/-   ##
==========================================
+ Coverage   53.83%   54.14%   +0.31%     
==========================================
  Files         198      198              
  Lines       17318    17329      +11     
  Branches     1155     1150       -5     
==========================================
+ Hits         9323     9383      +60     
+ Misses       7995     7946      -49     

Files with missing lines	Coverage Δ
src/azure/msal/msalAzureController.ts	46.40% <100.00%> (ø)
src/constants/locConstants.ts	80.81% <100.00%> (+0.02%)	⬆️
src/sharedInterfaces/connectionDialog.ts	95.45% <ø> (-0.11%)	⬇️
src/languageservice/serviceclient.ts	27.23% <0.00%> (ø)
src/controllers/connectionManager.ts	43.21% <0.00%> (+0.55%)	⬆️
src/controllers/mainController.ts	16.28% <0.00%> (+0.83%)	⬆️
src/connectionconfig/azureHelpers.ts	56.54% <0.00%> (ø)
...nectionconfig/connectionDialogWebviewController.ts	46.67% <55.88%> (+6.22%)	⬆️

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