Update monaco-editor-core to 1.96.3

[tsmaeder]

Feature Description:

Uplift our version of monaco to the latest available (1.96.3)

[tsmaeder]

Opened ip ticket https://gitlab.eclipse.org/eclipsefdn/emo-team/iplab/-/issues/18700

[tsmaeder]

So here's the current state of this work: I can build an ESM version of Monaco and the webpacked front- and back-ends seem to work fine with the necessary adjustments to our code. This is due to webpack transforming the import and export statements in the Monaco code to webpack_require calls when building.
However, this does not work when running the tests: The test run on nodejs and when we try to require anything from the monaco-editor-core package, it either complains that you "cannot use import outside of an ESM module" or (if we configure the module loading differently), that you "cannot require an ESM module from a CJS module".
This Problem can be solved by using babel to transpile everything to commonjs on the fly when running mocha. However, if we can transpile the code on the fly, we should also be able to compile the code from monaco to commonjs in the first place.
In fact, this is what we have been doing since adopting monaco 1.65.2 in 2022 (see #10736).

However, there remains the fact that VS Code seems to be moving toward ESM as the only module format: microsoft/vscode#226260. I believe we should consider moving to publishing Theia in ESM as well within the next year.

[tsmaeder]

See #13272