fixes #22593

This reverts commit 867e5213.

fixes #35577

related to #17108 #26484

fixes #30698

This update allows VS Code users to define the desired extensions directory by means of an environment variable "vscode_config_ext", instead of having to rely on the command-line arguments.  By providing a path to the extensions directory in an environment variable, VS Code is able to have a system or user defined extensions directory that does not require a wrapper script to launch code for the settings to take effect.  This solution is similar to the npm ENV variable solution "npm_config_cache".

This is 1/2 of the solution for providing a portable solution to remove VS Code from the Windows roaming profile.

Added --noGettingStarted flag to disable 'Getting Started' page from opening when such provided. Implements #26386.

Part of #329

fixes #20567

fixes #16836

related to #15558

Part of #13733

Fixes #15571

#15293