test: add a screenshot capture tier

The store screenshots were made by hand, so nothing kept them in step
with the UI. Add ./test screenshots, which boots a pixel_6 AVD on the
same image the e2e tier uses and overwrites the tracked PNGs.

The AVD is its own so a capture run cannot disturb the device state e2e
asserts against, and the panel comes from the device profile: forcing
geometry with wm size on a booted software-GPU emulator ANRs SystemUI
and the ANR dialog lands in the capture. SystemUI demo mode does the
same, so the status bar is left live. Each shot is rejected unless the
app owns the focused window and the PNG has the expected geometry.

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