fix(ui): load monaco-editor as a dependency and not from a third party CDN

[Masterchen09]

This PR adds the monaco-editor as a dependency and loads the editor from the local directory and not from a third party CDN. This fixes potential issues where the CDN is not reachable (see also #4955) and of course it is better to have all dependencies in one place and not relying on a third party service.

As it is quite hard (to not say impossible?) to import the monaco-editor in a Create React App (there are many issues, comments, etc. which describes the issues with it), the files are copied from the monaco-editor package to the build directory using the CopyWebpackPlugin and are then loaded by the @monaco-editor/react package from there.

The version of the added monaco-editor package is exactly the version which is loaded by the current version of the @monaco-editor/react package, therefore there shouldn't be any differences.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (build & test)

382 tests  ±0   382 ✔️ +2   9m 16s ⏱️ +29s
  89 suites ±0       0 💤 ±0 
  89 files   ±0       0 ❌  - 2 

Results for commit 41e41e8. ± Comparison against base commit af0e348.

[jjoyce0510]

This a really interesting fix. Totally agree that fetching this from a CDN dynamically was not the solution we wanted.

Let me do a bit of playing around with the changes, assuming all goes well we should be able to get this in!