Add polling based window waiting for testbed (#3047) #7555

Job	Run time
Check towncrier / Towncrier Checks	32s
Pre-commit checks / Pre-commit Checks	43s
Package Toga (core) / Create Python Package	24s
Package Toga (android) / Create Python Package	19s
Package Toga (cocoa) / Create Python Package	16s
Package Toga (demo) / Create Python Package	15s
Package Toga (dummy) / Create Python Package	17s
Package Toga (gtk) / Create Python Package	17s
Package Toga (iOS) / Create Python Package	19s
Package Toga (textual) / Create Python Package	15s
Package Toga (toga) / Create Python Package	18s
Package Toga (web) / Create Python Package	24s
Package Toga (winforms) / Create Python Package	26s
MicroPython compatibility	37s
Test core (macos-latest, 3.9)	1m 3s
Test core (macos-latest, 3.10)	59s
Test core (macos-latest, 3.11)	51s
Test core (macos-latest, 3.12)	47s
Test core (macos-latest, 3.13)	48s
Test core (ubuntu-latest, 3.9)	54s
Test core (ubuntu-latest, 3.10)	53s
Test core (ubuntu-latest, 3.11)	50s
Test core (ubuntu-latest, 3.12)	1m 17s
Test core (ubuntu-latest, 3.13)	1m 11s
Test core (windows-latest, 3.9)	1m 38s
Test core (windows-latest, 3.10)	1m 29s
Test core (windows-latest, 3.11)	1m 36s
Test core (windows-latest, 3.12)	1m 51s
Test core (windows-latest, 3.13)	2m 47s
Coverage	35s
Testbed (macOS-x86_64)	8m 54s
Testbed (macOS-arm64)	5m 56s
Testbed (windows)	7m 27s
Testbed (linux-x11)	5m 1s
Testbed (linux-wayland)	5m 20s
Testbed (android)	10m 49s
Testbed (iOS)	6m 43s
Testbed (textual-linux)	57s
Testbed (textual-macOS)	1m 3s
Testbed (textual-windows)	2m 24s
	1h 19m 25s

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