Update Monaco Editor to V0.25.2 (latest)

[Steve-Mcl]

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

Update Monaco Editor to V0.25.2 (latest)

Additionally, with 0.25.2 the unhandled Canceled promise rejection on mousemove event is no longer an issue so the temporary global window hander for this rejection has been removed from monaco.js.

Lastly, an issue with a promise rejection upon opening function node editor UI was noted and fixed in this update.

NOTE
When running grunt, I had to install nyc

Running "nyc:all" (nyc) task
'nyc' is not recognized as an internal or external command,
operable program or batch file.
Fatal error: spawn nyc ENOENT

Should nyc be in the devDependancies? or is this something you have installed globally?

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality