Add policy service override

[CGNonofr]

Allows to apply some policies, like limiting the installable extensions:

  ...getPolicyServiceOverride(
    new Map(
      Object.entries({
        AllowedExtensions: JSON.stringify({
          github: true,
          microsoft: true,
          codingame: true
        })
      })
    )
  )

see https://code.visualstudio.com/docs/setup/enterprise#_configure-allowed-extensions

[kaisalmen]

LGTM. Later this time, was AFK yesterday evening...

[github-actions]

🎉 This PR is included in version 23.1.0 🎉

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