Fix test name to include specification & feature name

[jdaugherty]

I was only putting the method name in the saved file name, now the file will have the full path.

Here's an example after this change:

Before it would have been PASSED-should_be_able_to_use_download_methods-20241209-140435.mp4

[matrei]

Suggestion for code formatting and logic:

    ContainerGebTestDescription(IterationInfo testInfo) {
        testId = [
                testInfo.feature.spec.displayName,
                testInfo.feature.displayName,
                testInfo.displayName != testInfo.feature.displayName ? testInfo.displayName : null,
                testInfo.displayName != testInfo.feature.displayName ? testInfo.iterationIndex : null
        ].findAll(/* Remove nulls */).join(' ')

        String safeName = testId.replaceAll('\\W+', '_')
        filesystemFriendlyName = safeName
    }