Update vscode settings

[snuggs]

Description

1. Fixes bug in .vscode/settings.json
2. Adds .test extension to vscode

Motivation and Context

Test files have a .test extension but contain javascript (for this project)

How Has This Been Tested?

@rianby64 can you quarterback this? ICANHAZ VIM. 🐱 /cc @brandondees

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

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[brandondees]

Yeah I don't have a definite answer, other than to look into alternative formats that support the use cases better, or to create a workaround that complies with the format's rules

{
  'foo': 1,
  '_comment': "Let's explain some stuff"
}

[brandondees]

I'll try to take a look at testing this setup tomorrow

[snuggs]

@brandondees cool. This should be good to go and make @rianby64 happy. Care to review so i can haz merge??