[ruff F401 #10390 #10391] generate two fixes (instead of one) for the two groups of import statement bindings; then iterate over those bindings and the fix which applies to them
[ruff F401 #10390 #10391] restore the old condition used to enable/disable F401 based on deprecated flag, but use the preview flag; move the testcases down to the preview testcase section; move the insta-snapshots to the preview paths
[ruff F401 #10390 #10391] delete the init_unused_import_opt_in_to_fix test and add a test-case for the preview linter rules that references that fixture; move its insta-snapshot to the location used by the new test-case