Ensure that widgets can be garbage collected on each platform #6739

Job	Run time
Check towncrier / Towncrier Checks	32s
Pre-commit checks / Pre-commit Checks	40s
Package Toga (cocoa) / Create Python Package	30s
Package Toga (android) / Create Python Package	18s
Package Toga (core) / Create Python Package	25s
Package Toga (demo) / Create Python Package	14s
Package Toga (dummy) / Create Python Package	17s
Package Toga (gtk) / Create Python Package	17s
Package Toga (iOS) / Create Python Package	15s
Package Toga (textual) / Create Python Package	13s
Package Toga (toga) / Create Python Package	16s
Package Toga (web) / Create Python Package	28s
Package Toga (winforms) / Create Python Package	18s
Test core (macos-12, 3.8)	1m 11s
Test core (macos-12, 3.12)	1m 20s
Test core (macos-12, 3.13-dev)	1m 52s
Test core (macos-14, 3.12)	45s
Test core (macos-14, 3.13-dev)	1m 16s
Test core (ubuntu-latest, 3.8)	58s
Test core (ubuntu-latest, 3.12)	57s
Test core (ubuntu-latest, 3.13-dev)	1m 6s
Test core (windows-latest, 3.8)	1m 42s
Test core (windows-latest, 3.12)	1m 27s
Test core (ubuntu-latest, 3.9, false)	52s
Test core (ubuntu-latest, 3.10, false)	47s
Test core (ubuntu-latest, 3.11, false)	55s
Testbed (macOS-x86_64)	6m 26s
Coverage	27s
Testbed (macOS-arm64)	3m 25s
Testbed (windows)	5m 29s
Testbed (linux-x11)	2m 57s
Testbed (linux-wayland)	3m 14s
Testbed (android)	9m 6s
Testbed (iOS)	6m 46s
Testbed (textual-linux)	49s
Testbed (textual-macOS)	54s
Testbed (textual-windows)	1m 43s
	1h 1m 7s

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