This changes the compiler output for gradle to be less verbose and more easily read.
This only applies to compilation error messages: other gradle messages will continue to print as before.
It also fixes a small problem with the performance measurement printing (see that "7.1s" on it's own line in the original?) so that if something is expected to have multiple lines of output, it prints an initial line, and a "Done" line with the elapsed time, so that it's possible to know what the time applies to.
It also updates the spinner to be fancier, at least on platforms other than Windows (which is missing a lot of symbols in its console font).
Addresses #17307
* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test
