Call clean task with verifyPaparazziDebug

[luizgrp]

WHAT

Call clean task with verifyPaparazziDebug

WHY

In order to prevent it using cache, in an attempt to fix #339

HOW

• add clean task to be called with verifyPaparazziDebug;
• move "snapshot test" step to be executed after "upload test reports" step, due to the clean task that would delete the previously generated reports;
• change "upload snapshot tests failures" step to also archive the test results and to run "always";

Checklist 📋

• [N/A] Add explicit visibility modifier and explicit return types for public declarations
• [N/A] Run spotless check
• Run tests
• [N/A] Update metalava's signature text files

[luizgrp]

With this PR, this issue #340 is surfaced again:

> Task :media-ui:testDebugUnitTest
com.google.android.horologist.media.ui.FigmaVolumeScreenTest > volumePlayerScreen FAILED
    java.lang.NullPointerException at FigmaVolumeScreenTest.kt:46