Trim error stacktraces

[pyricau]

Junit 4.13 provides Failure.getTrimmedTrace() as an alternative to Failure.getTrace():

    /**
     * Gets a the printed form of the exception, with a trimmed version of the stack trace.
     * This method will attempt to filter out frames of the stack trace that are below
     * the test method call.
     */
    public String getTrimmedTrace() {
        return Throwables.getTrimmedStackTrace(getException());
    }

This could be used in InstrumentationResultPrinter.reportFailure() to report shorter stacktraces, avoiding binder transaction errors (#269) but also making those stacktraces more relevant.

Related conversation: https://github.com/android/android-test/pull/711/files#r480418828

Unfortunately getTrimmedTrace is only available in JUnit 4.13 and Androidx.test still uses junit 4.12.

Another option is to bring in just the part we need until then: https://github.com/junit-team/junit4/blob/r4.13/src/main/java/org/junit/internal/Throwables.java