Add usage statistics for UI Unit testing and End-to-End testing

[mshabarov]

Add a usage statistics to TestBench for collecting the usage of UI Unit testing features and End-to-End testing features. This was drafted in https://github.com/vaadin/testbench/pull/1587, but doesn't work because of https://github.com/vaadin/testbench/pull/1587#issuecomment-1372084963 .

Possible solution is to add usage statistics of TB to the platform, where both TB modules and Flow modules are available (not tested yet).