History of tests::mount 1 change

In crates/flow/src/cache.rs, lines 258–266 on 0f2b8eca36b8dd185236825d2687c1dbc009590c2d5a51ade3da9b94b4ed5195. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 258,266:crates/flow/src/cache.rs.