Test 'enabledApiProposals'

[jrieken]

Refs: #131165

• anyOS @alexr00
• anyOS @roblourens
• anyOS @aeschli

Complexity: 4

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The rules for how proposed API can be used is changing. This gist is that access is scoped to individual proposals and that there is no more wildcard access to all proposals. The testing here is to follow the migration guide that we have setup for extension authors that are spelled out in product.json - like you.

• read through the mail that we are planning to send: https://github.com/microsoft/vscode-internalbacklog/issues/2461#issuecomment-970335589
• for your extension follow the guide that the mail mentions (Where is vscode.proposed.d.ts? #136964)