Provide a command line flag to disable safeStorage

[bpasero]

Same as --disable-keytar, something that entirely skips the use of safeStorage for our integration and smoke tests to prevent possibly login dialogs blocking the run.

I am not sure if we would have to adopt it for our extension test runner as well: https://github.com/microsoft/vscode-test/blob/453dba554a09d05116491cf2f82fe1341c537b6e/lib/runTest.ts#L131-L142

[TylerLeonhardt]

/duplicate #188432

[vscodenpa]

Thanks for creating this issue! We figured it's covering the same as another one we already have. Thus, we closed this one as a duplicate. You can search for similar existing issues. See also our issue reporting guidelines.

Happy Coding!