Invalid results from FTS or vector search after a data replacement

A DataReplacement operation can modify a column that is indexed. Today we will drop the modified fragment from the index's fragment bitmap. However, this does not avoid invalid results because the fragment bitmap might cover other fragments included in the search.

For example:

1. Write fragments 1 & 2.
2. Create index covering fragments 1 & 2.
3. Update fragment 1 in-place with DataReplacement. Fragment 1 is removed from the index's bitmap.
4. Search whole dataset

The search will target fragments 1 & 2. It will search the index because it covers fragment 2. It will search fragment 1 because it is unindexed. The search results from the index search will include fragment 1 rows even though it should not.

Start by tracing DataReplacement handling and the FTS/vector search code that uses the index fragment bitmap. Reproduce the sequence of writing fragments 1 and 2, indexing them, replacing fragment 1, and searching the full dataset. Done means searches no longer return replaced fragment rows from the index while still covering valid indexed fragments.