Fix integration tests on 1.95.0 and switch back to 'stable' channel

[dibarbet]

Switched to 1.94.2 here to fix breaks in code action tests - #7708

[dibarbet]

Cause appears to be microsoft/vscode#232679

Introducing an artificial 2 second delay in our code action handler causes the test to fail 100% of the time locally. CI logs show the code action request taking about ~2 seconds for the failing instances in CI as well. Passing tests have the code action request finish in under a second.

[dibarbet]

Resolved by microsoft/vscode#232772

Once it makes it into a vscode stable release we can switch back.