Verify finalization of the paste api

[mjbvz]

Test for #30066

• Any @jrieken
• Any @anthonykim1

Complexity: 3

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The document paste api has already gone through pretty extensive testing over a number of iterations. We have now finalized this API so for this test plan item, I'd like one last sanity pass over the API to check that everything works as expected

Testing

1. Use the document paste API sample here: https://github.com/microsoft/vscode-extension-samples/tree/main/document-paste

2. Confirm you can run this without any proposed API enabled flags (you will still need the vscode.d.ts from main for now)

3. Look over the sample code and confirm it is document. Also give it a test and confirm you can use the custom copy paste behavior from the sample

4. Review the docs for the finalized api in vscode.d.ts. Start at registerDocumentPasteEditProvider and look through all the related types and their documentation. Make sure these look good. You can also use intellisense in the document paste sample to review the rendered docs