Test: String array Setting GUI

[octref]

Test for #62440

• anyOS @kieferrm
• anyOS @chrisdias

Complexity: 1

Overview
Settings that has type: array and item: string can now be edited in the Settings GUI. Here are builtin items that match this criteria:

terminal.integrated.commandsToSkipShell
terminal.integrated.shellArgs.linux
terminal.integrated.shellArgs.osx
css.experimental.customData
css.lint.validProperties
html.experimental.customData
less.lint.validProperties
scss.lint.validProperties
typescript.tsserver.pluginPaths

Extension-contributed string array settings include prettier.disableLanguages.

Testing

• Test that you can add/edit/remove items for those settings

  

• Test that you can add/edit/remove string array settings contributed by extensions (such as prettier for prettier.disableLanguages)

• Test that you can modify this minimal sample to contribute a new string array setting that uses this GUI