integrity check should verify non-binary collation indexes have the right data

[jussisaurio]

row N values differ from index X — For non-BINARY collation indexes, verifies that the index actually stores the correct values. Without this, an index using e.g. NOCASE collation could have stale data that Found wouldn't catch (since Found uses the index's collation).

[turso-github-handyman]

Fix is ready for review: compare with main