Flip imports to case insensitive sorting

[jakebailey]

After merging #51565, I went to merge it into SFT only to hit issues with auto-imports; it looks like auto-imports always inserts new imports at the bottom unless the imports are sorted case-insensitivly.

Flipping these imports to case insensitive means that future auto-imports seem to be inserted in the right place.

[weswigham]

We should file 2 bugs:

1. To fix auto imports insertion order on case-sensitive import lists
2. To swap our imports back once we've shipped said fix

[jakebailey]

How much do we need 2? My only problem is just that it's more churn for other PRs again if I reorder everything. I suppose it's one time, but I don't know that it actually matters what the order is as long as it merges well (which any sort will do).