[dart2wasm] Go over approved failures in all configurations and get to a 0 approved failures (modulo e.g. CFE issues and experimental co19 tests)

[mkustermann]

We shouldn't have any approved failures in dart2wasm test configurations. We should go over the remaining approved failures and see if we can get them working or modified or skipped (depending on what makes sense).

This includes failures in minified mode (see #60397) where we should update the tests to self-detect if they run in minified mode and in that case either skip itself or not expect unminified names.