Revert zero-width non-joiner insertion in text shaping (#41043)

Reverts parts of https://github.com/zed-industries/zed/pull/39928
Closes https://github.com/zed-industries/zed/issues/40987

Release Notes:

- Fixed some fonts rendering with absurd spacing on MacOS
66ec0fc0e1Lukas Wirth committed on 10/23/2025, 7:22:28 PM· committed by GitHubparent435eab6
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