Update monaco-editor-webpack-plugin with bug fix patch release

What does this MR do?

Updates monaco-editor-webpack-plugin to the latest version compatible with our version of monaco-editor.

Also removes a workaround that we had employed for a bug in this plugin which was resolved in a previous version.

Does this MR meet the acceptance criteria?

Conformity

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Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
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