Set proper scope for machine based settings

[jpogran]

This sets the following settings to machine-overridable scope. This ensures these settings will be read in the correct location whether the user is using the extension locally or in a remote context like the Remote Extensions or Codespaces.

It is set to machine-overridable instead of just machine, to still allow users to have these settings set inside a Workspace file or in the Workspace folder. If we set it to just machine, the settings would not be modifiable in the Workspace file or in the Workspace folder scopes.

terraform.languageServer.path
terraform.languageServer.args
terraform.languageServer.terraform.path
terraform.languageServer.terraform.timeout
terraform.languageServer.terraform.logFilePath
terraform.languageServer.rootModules
terraform.languageServer.excludeRootModules
terraform.languageServer.ignoreDirectoryNames

For all other settings, this sets the scope to the default window. This removes the error messages being logged in the extension host about accessing a resource scoped setting using a non resource scoped method:

[2022-06-29 12:40:41.683] [exthost] [warning] [hashicorp.terraform] Accessing a resource scoped configuration without providing a resource is not expected. To get the effective value for 'terraform.languageServer.enable', provide the URI of a resource or 'null' for any resource.

[dbanck]

Looks like a sensible choice of scopes to me. We could remove `"scope": "window", since it's the default. But I'm also okay with being explicit here.

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