feat(vscode-extension): add runnable tag tasks to Tags view

[wind-Runners-404]

Fix Issue: #90

Display tasks under each tag in the Tags view and allow running them directly for all projects with that tag.
The tag view now includes:

• Tasks section: lists runnable tasks across projects with the tag
• Projects section: lists projects associated with the tag

Executing a task under a tag runs moon run "#tag:task" using the VS Code task runner.

[milesj]

@wind-Runners-404 Tasks will be getting a tag system in the future, so this directly conflicts with that.

[wind-Runners-404]

Thanks for the feedback.
I wasn’t aware a task-level tag system is planned.

My goal here was mainly to expose the existing moon run "#tag:task" functionality in the UI, especially for users who aren’t comfortable using the CLI. Since this is just showing the current behavior and not introducing a new tagging system, I was thinking it might still be useful as a UI improvement.

If this conflicts with the upcoming design, I’m happy to:

• adjust the implementation to better align with it, or
• limit this to a temporary/optional feature until the new tag system is introduced.

Let me know how you would prefer this to be handled.