Introduce hover tests and context menu

[haydar-metin]

What it does

• Introduces hover tests and a basic context menu PO.
• Makes the other tests more defensive by waiting if the specific elements are visible (e.g., by using waitForCreation)
• Increased the timeout for VSCode and Theia - they need more time sometimes.
• Introduce inverse of skipIntegration called skipNonIntegration, which does the opposite.
• The newest version of VSCode changed the DOM of the file explorer - fixes it.

Works on eclipse-glsp/glsp#1287

How to test

Tested with GLSP v2.1.1.

• Run all tests. yarn test.

Follow-ups

Bug found

examples/workflow-test/tests/features/validation/marker.spec.ts

• The marker › should be still visible after resizing failing for all integrations.

Steps:

Changelog

• This PR should be mentioned in the changelog
• This PR introduces a breaking change (if yes, provide more details below for the changelog and the migration guide)

Renames:

• the method deselect in GLSPGraph has been renamed to focus.

[tortmayr]

Thanks a lot.
Code looks good to me and works great. Only a few minor comments.

[tortmayr]

We can leave this in for now, but should remove it once glsp-playwright is part of the general glsp release train (eclipse-glsp/glsp#1267).
Once that is the case it pretty self explantory that a specific version of glsp-playwright is compatible with the exact same version of the client/integration packages.

[tortmayr]

What we should add instead here is the minimum required VS Code version. I assume since the newest version changed the dom for the file explorer the tests no longer with older versions right?

[haydar-metin]

Yes, good point. Maybe we should also lock the VS Code instance to a specific version - right now it always downloads the newest version.

[haydar-metin]

Thanks! We will have some failing tests as the latest released version of GLSP (2.1.1) doesn't have the fixes to the bugs found here. I will introduce in a separate PR a script that will setup the different repositories automatically, so that we can work with the latest version in master.

[tortmayr]

👍🏼 Could you pleas list the tests which are expected to fail for now?

[haydar-metin]

 3 failed
   [standalone] › ../../tests/features/validation/marker.spec.ts:50:9 › The marker › should be still visible after resizing 
   [theia] › ../../tests/features/validation/marker.spec.ts:50:9 › The marker › should be still visible after resizing 
   [vscode] › ../../tests/features/validation/marker.spec.ts:50:9 › The marker › should be still visible after resizing 

For GLSP-Client 2.1.1

[tortmayr]

Thanks. LGTM!