Lite Query Store slice repair doesn't see compaction part files #4721

Lite's QueryStoreSliceRepairService finds the files it rewrites by listing *_query_store_stats.parquet. Compaction can split a month into part files (*_query_store_stats_ptNNN.parquet), and the listing doesn't match those, so the repair never sees the rows in them.

• Where: Lite/Services/QueryStoreSliceRepairService.cs, the file listing.
• Expected: the repair covers part files as well as whole-month files. It rewrites files in place, so each part file is rewritten on its own, with the same checks as a whole-month file.
• Test that must fail first: a month split into part files, with a slice that needs repair in one part, is repaired.
• Related: Lite archive: keep every row through compaction, the size reset and tab Refresh #4718 added part files to the archive views; the repair listing was left as it was.