History of tests::mount 1 change

In crates/flow/src/cache.rs, lines 258–266 on fc2a6d1817c0cc3507281b7ae2894ee29787ec89a7629aae9649f8b81118fe2b. 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.