@backstage/migrate-mui-autocomplete-to-combobox

Heuristically migrates MUI 4 Autocomplete to Backstage UI Combobox or SearchAutocomplete.

Covers

• Form-like option pickers with string[] literal options → Combobox
• Clear free-text search (onInputChange + word-boundary search/find/filter cue, no selection value) → SearchAutocomplete
• Deep and barrel imports from @material-ui/lab
• Best-effort option literal flattening for string arrays
• Prunes unused TextField imports left behind by renderInput
• Maps MUI size to BUI size (small preserved; medium/large/omitted → medium; falls back to static size on the renderInput TextField)

TODOs left for humans

• Ambiguous Autocomplete usage (left as MUI with a TODO)
• Object options / getOptionLabel shapes (not safe for BUI Combobox)
• freeSolo, custom renderOption, and other complex cases
• Non-trivial onChange / options shapes
• Dynamic size on Autocomplete

Won't do

• Perfect API parity for every Autocomplete prop