Fixes #11099 : Indexes lost upon `.swap_dims()` call#11100

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Reshief wants to merge 3 commits intopydata:mainfrom

Commits on Jan 23, 2026

Fixes #11099 : indexes of non-dimension variable names being lost upon `ds.swap_dims()` call
Reshief
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Add test for indexes being preserved for non-dimension coordinates
Reshief
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Restore behavior of swap_dims() to pass existing tests
Reshief
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