[🚫 Bug] get-vscode should be idempotent

[ssbarnea]

Describe the bug

At this moment running extest get-vscode will always re-download and uncompressed vscode instead of doing it only if the current version is outdated or missing.

This is important because it prevent use of caching of the TEST_RESOURCES folder between CI jobs and also causing random networking related failures.

It should be noted that its sister command extest get-chromedriver is able to benefit from caching as it reports, "exists in local cache, skipping download".

Steps to reproduce

time extest get-vscode
...

# second run should not take more than 2s:
time extest get-vscode

Logs

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Operating System

Visual Studio Code

vscode-extension-tester

8.12.0

NodeJS

20

npm

No response