bisync: the tests are too noisy

The bisync tests are too noisy.

rclone/rclone/cmd/bisync$ go test 2>&1 | wc -l
5527

When they go wrong in CI it is almost impossible to figure out what went wrong, eg https://github.com/rclone/rclone/actions/runs/8572078457/job/23493782434 - this is partly due to the hard to use web page which involves lots of scrolling within windows, but I think we can do better.

Ideally I'd like the tests to print nothing by default, except actual test failures. If we want to see more info then there is the -verbose flag (fstest.Verbose) which by default enables DEBUG logging, but in bisync's case you can use it to print as much stuff as you want.

What do you think @nielash ?

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