Changes to allow reporting success with an action on sqlTasksService

[allancascante]

Description

This PR refactors the task completion notification system to eliminate duplicate notifications for DacFx operations (Export BACPAC, Extract DACPAC, Import BACPAC, Deploy DACPAC) and provides a generic, configurable solution for custom task completion handlers, as reported in this bug.

Problem
Previously, DacFx operations showed two notifications:

A custom notification with action button from dacpacDialogWebviewController
A generic completion notification from sqlTasksService

Solution

Centralized all task completion notification logic in sqlTasksService with a configurable handler registration system.

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	5262 KB	5262 KB	⚪ 0 KB ( 0% )
sql-database-projects VSIX	5627 KB	5627 KB	⚪ 0 KB ( 0% )

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.94%. Comparing base (3109cca) to head (fc1a170).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
extensions/mssql/src/controllers/mainController.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20651      +/-   ##
==========================================
+ Coverage   62.65%   62.94%   +0.29%     
==========================================
  Files         209      209              
  Lines       19350    19390      +40     
  Branches     2461     2464       +3     
==========================================
+ Hits        12124    12206      +82     
+ Misses       7146     7102      -44     
- Partials       80       82       +2     

Files with missing lines	Coverage Δ
extensions/mssql/src/constants/constants.ts	100.00% <100.00%> (ø)
...l/src/controllers/dacpacDialogWebviewController.ts	92.16% <ø> (+0.64%)	⬆️
extensions/mssql/src/services/dacFxService.ts	53.94% <100.00%> (+48.68%)	⬆️
extensions/mssql/src/services/sqlTasksService.ts	82.35% <100.00%> (+45.88%)	⬆️
extensions/mssql/src/controllers/mainController.ts	16.88% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[kburtram]

If this method is only used for DACPAC-related completion handlers, could we rename it to something more specific like registerDacpacTaskCompletionHandlers?

Also, I’m wondering if we should start moving some of this logic out of mainController into feature-specific modules (e.g. a DACPAC-specific file) and just import/register them here. This file is starting to get quite large, and splitting by feature area might make it easier to maintain.

[Benjin]

I'm thinking this registration should be done by the dacpacDialogWebviewController when it launches the first time. It wouldn't need to unregister upon webview disposal because that would revert to the less helpful task completion.

[Benjin]

Or maybe the dacfxService constructor would be even better.