Revert "settings: Remove `version` field migration" (#33729)

- Reverts zed-industries/zed#33711

I think we should just make this a breaking change with v0.194.x.
Forwards compatibility is hard, we should build abstractions that make
this easier (next time).

See also:
- https://github.com/zed-industries/zed/pull/33372

Release Notes:

- N/A
6b06685723Peter Tripp committed on 7/1/2025, 6:21:26 PM· committed by GitHubparent8d894dd
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