Data editor opens multiple windows for same file

## Description

When re-running a parse using the `Debug Last File` button, the data editor will open another tab for the data file, even though there is already one (or more) open and running.

This seems related to the new data messaging system that was recently merged: (Restructure data editor messaging with Message Registry
#1647 )

## Steps to Reproduce

1. Make sure that the schema file is the active tab
2. Click on the small debug pull-down icon near the top right corner of the schema editor window
3. Click on the `Debug Last File` button and begin debugging
4. See that an additional data editor window has opened.
## Expected Behavior

Previous window becomes active

## Actual Behavior

Additional window opens.

## Additional Notes and Screenshots (optional)

## Environment

- Operating System(s): Windows 11

- Browser/VS Code version: 1.123.0

- Extension version: 1.6.0-SNAPSHOT 6/29