Checkbox for Boolean inputs when triggering `workflow_dispatch`

**Is your feature request related to a problem? Please describe.**
When triggering a workflow via the view in vscode, the extension asks for input values. Currently, it generates an error when giving a string that is not `true` or `false` for boolean inputs.

**Describe the solution you'd like**
Use a checkbox input instead of a string input when asking vscode user for input.

**Additional context**
Add any other context or screenshots about the feature request here.

Start by locating the VS Code prompt used when triggering workflow_dispatch and the handling for boolean inputs; the issue does not name a file or test. Replace the string prompt behavior with a checkbox for boolean inputs, while preserving the existing workflow trigger flow, and verify that the resulting value is accepted as true or false.

Written by the indexing model from the issue text.