Add polling based window waiting for testbed #7554

Job	Run time
Pre-commit checks / Pre-commit Checks	43s
Check towncrier / Towncrier Checks	28s
Package Toga (android) / Create Python Package	15s
Package Toga (cocoa) / Create Python Package	17s
Package Toga (core) / Create Python Package	17s
Package Toga (demo) / Create Python Package	25s
Package Toga (dummy) / Create Python Package	27s
Package Toga (gtk) / Create Python Package	15s
Package Toga (iOS) / Create Python Package	28s
Package Toga (textual) / Create Python Package	16s
Package Toga (toga) / Create Python Package	23s
Package Toga (web) / Create Python Package	23s
Package Toga (winforms) / Create Python Package	15s
MicroPython compatibility	34s
Test core (macos-latest, 3.9)	1m 5s
Test core (macos-latest, 3.10)	1m 3s
Test core (macos-latest, 3.11)	47s
Test core (macos-latest, 3.12)	49s
Test core (macos-latest, 3.13)	47s
Test core (ubuntu-latest, 3.9)	52s
Test core (ubuntu-latest, 3.10)	59s
Test core (ubuntu-latest, 3.11)	48s
Test core (ubuntu-latest, 3.12)	1m 0s
Test core (ubuntu-latest, 3.13)	1m 5s
Test core (windows-latest, 3.9)	1m 48s
Test core (windows-latest, 3.10)	1m 53s
Test core (windows-latest, 3.11)	1m 42s
Test core (windows-latest, 3.12)	1m 46s
Test core (windows-latest, 3.13)	2m 25s
Coverage	37s
Testbed (macOS-x86_64)	9m 22s
Testbed (macOS-arm64)	5m 57s
Testbed (windows)	8m 0s
Testbed (linux-x11)	5m 1s
Testbed (linux-wayland)	5m 32s
Testbed (android)	11m 8s
Testbed (iOS)	11m 20s
Testbed (textual-linux)	1m 7s
Testbed (textual-macOS)	1m 1s
Testbed (textual-windows)	1m 44s
	1h 25m 4s

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