Don't support cloning the extensions view (#7875)

Fixes https://github.com/zed-industries/zed/issues/7840

We could support this later, but for now, I don't think we need to.

Release Notes:

- N/A

Co-authored-by: Nathan <nathan@zed.dev>
2e0d18ee76Max Brunsfeld committed on 2/16/2024, 4:48:47 PM· committed by GitHubparentc5a23fa
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