Include the test name in the screenshot file name generated by the DefaultFailureHandler

### Description

It would be great to extend the DefaultFailureHandler so that the name of the test becomes part of the file name of the screenshot that is saved on failure.

I have worked around that issue by implementing a custom FailureHandler (https://github.com/Futsch1/medTimer/blob/main/app/src/androidTest/java/com/futsch1/medtimer/MyFailureHandler.java), but I suppose this change could be of general interest.

### Steps to Reproduce

Run a test suite with several tests, where more than one failure occurs.

### Expected Results

Screenshots are present for each occurred failure

### Actual Results

Only the screenshot(s) of the last failed run will be present.

### AndroidX Test and Android OS Versions

Android Test version 3.6.1
Android OS version not relevant

### Link to a public git repo demonstrating the problem:

https://github.com/Futsch1/medTimer/actions/runs/12536536718/job/34960077359 respectively corresponding reports here: https://github.com/Futsch1/medTimer/actions/runs/12536536718/artifacts/2369493552

Start by locating the DefaultFailureHandler and tracing how it names and saves screenshots when a test fails. Reproduce the issue with a suite containing multiple failures, then verify that each saved screenshot has a distinct test name and that screenshots from all failures remain available.

Written by the indexing model from the issue text.