Ensure that widgets can be garbage collected on each platform #6736

Job	Run time
Check towncrier / Towncrier Checks	34s
Pre-commit checks / Pre-commit Checks	35s
Package Toga (demo) / Create Python Package	23s
Package Toga (cocoa) / Create Python Package	18s
Package Toga (core) / Create Python Package	15s
Package Toga (dummy) / Create Python Package	17s
Package Toga (gtk) / Create Python Package	29s
Package Toga (iOS) / Create Python Package	26s
Package Toga (toga) / Create Python Package	22s
Package Toga (textual) / Create Python Package	21s
Package Toga (android) / Create Python Package	28s
Package Toga (web) / Create Python Package	22s
Package Toga (winforms) / Create Python Package	15s
Test core (macos-12, 3.8)	1m 12s
Test core (macos-12, 3.12)	1m 18s
Test core (macos-12, 3.13-dev)	1m 55s
Test core (macos-14, 3.12)	47s
Test core (macos-14, 3.13-dev)	1m 2s
Test core (ubuntu-latest, 3.8)	51s
Test core (ubuntu-latest, 3.12)	1m 7s
Test core (ubuntu-latest, 3.13-dev)	1m 5s
Test core (windows-latest, 3.8)	1m 25s
Test core (windows-latest, 3.12)	1m 39s
Test core (ubuntu-latest, 3.9, false)	56s
Test core (ubuntu-latest, 3.10, false)	56s
Test core (ubuntu-latest, 3.11, false)	46s
Coverage	29s
Testbed (macOS-x86_64)	4m 35s
Testbed (macOS-arm64)	3m 21s
Testbed (windows)	5m 28s
Testbed (linux-x11)	3m 0s
Testbed (linux-wayland)	3m 36s
Testbed (android)	8m 1s
Testbed (iOS)	6m 47s
Testbed (textual-linux)	55s
Testbed (textual-macOS)	52s
Testbed (textual-windows)	1m 39s
	58m 47s

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