fix: Force pasting plain text in code block

[matthewlipski]

This PR forces pasting plain text from the clipboard inside code blocks, as it cannot be formatted anyway and can otherwise result in unexpected behaviour.

Note: No unit test for this has been added as our you have to explicitly choose the clipboard data format for paste tests, which doesn't support this scenario. I think this is fine as it's an explicit edge case anyway.

Closes #1594

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Name	Status	Preview	Updated (UTC)
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commit: daa6d48