## Summary of the Pull Request
Currently when configuring the action
```json
{ "command": { "action": "closeTabsAfter" } }
```
we get a schema error in VSCode: `Matches multiple schemas when only one must validate.`.
The problem is that it matches both `closeTabsAfter` and `closeTab`, since the schema uses regex patterns to match instead of plain strings. I swapped the usage of `"pattern"` with `"const"` for all actions.
## PR Checklist
* [ ] Closes #xxx
* [x] CLA signed
* [ ] Tests added/passed
* [ ] Documentation updated
* [x] Schema updated
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan
## Detailed Description of the Pull Request / Additional comments
## Validation Steps Performed
I checked and this action configuration no longer errors.
fd93c54ae3