Provide per-platform screenshots for each widget #4402

Job	Run time
Pre-commit checks / Pre-commit Checks	40s
Check towncrier / Towncrier Checks	27s
Python Package (core) / Create Python Package	1m 8s
Python Package (cocoa) / Create Python Package	1m 16s
Python Package (dummy) / Create Python Package	55s
Python Package (demo) / Create Python Package	1m 32s
Python Package (gtk) / Create Python Package	1m 6s
Python Package (iOS) / Create Python Package	1m 9s
Python Package (textual) / Create Python Package	1m 13s
Python Package (toga) / Create Python Package	52s
Python Package (web) / Create Python Package	1m 15s
Python Package (android) / Create Python Package	1m 3s
Python Package (winforms) / Create Python Package	1m 29s
core (macos, 3.8)	54s
core (macos, 3.9)	24s
core (macos, 3.10)	54s
core (macos, 3.11)	1m 3s
core (macos, 3.12)	1m 31s
core (ubuntu, 3.8)	31s
core (ubuntu, 3.9)	51s
core (ubuntu, 3.10)	34s
core (ubuntu, 3.11)	1m 8s
core (ubuntu, 3.12)	1m 9s
core (windows, 3.8)	1m 8s
core (windows, 3.9)	1m 20s
core (windows, 3.10)	1m 24s
core (windows, 3.11)	1m 24s
core (windows, 3.12)	1m 23s
Combine & check core coverage.	1s
testbed	1s
	29m 45s

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