Desktop: Beta editor plugin API: Fix plugins unable to require nodeJS modules

[personalizedrefrigerator]

Summary

Fixes an issue where plugins like Enhancement failed to load in the CodeMirror 6 editor because require failed to import modules like path.

Note that Webpack preserves NodeJS modules required from content scripts with our current Webpack configuration.

Testing

This has been tested successfully by:

1. Applying the following diff:

diff --git a/packages/app-cli/tests/support/plugins/codemirror6/src/contentScript.ts b/packages/app-cli/tests/support/plugins/codemirror6/src/contentScript.ts
index 5e61478af..c7ff50126 100644
--- a/packages/app-cli/tests/support/plugins/codemirror6/src/contentScript.ts
+++ b/packages/app-cli/tests/support/plugins/codemirror6/src/contentScript.ts
@@ -5,6 +5,7 @@
 // the editor to not work properly.
 //
 import { lineNumbers, highlightActiveLineGutter, } from '@codemirror/view';
+const path = require('path');
 //
 // For the above import to work, you may also need to add @codemirror/view as a dev dependency
 // to package.json. (For the type information only).
@@ -29,6 +30,7 @@ export default (_context: { contentScriptId: string }) => {
 
 			// See https://codemirror.net/ for more built-in extensions and configuration
 			// options.
+			console.log('test: ', path.resolve('.'));
 		},
 
 		// There are two main ways to style the CodeMirror editor:

2. Rebuilding the example CodeMirror 6 plugin.
3. Inspecting the built .jpl file to verify that it does include require('path').
4. Starting Joplin (the beta editor was already enabled and the CodeMirror 6 demo plugin was already added to Joplin as a development plugin)
5. Verifying that test: followed by a path was logged to Joplin's development tools.

This has been tested successfully on Ubuntu 23.10.