Add polling based window waiting for testbed #7484

Job	Run time
Check towncrier / Towncrier Checks	37s
Pre-commit checks / Pre-commit Checks	39s
Package Toga (android) / Create Python Package	19s
Package Toga (core) / Create Python Package	17s
Package Toga (cocoa) / Create Python Package	29s
Package Toga (dummy) / Create Python Package	14s
Package Toga (demo) / Create Python Package	19s
Package Toga (gtk) / Create Python Package	15s
Package Toga (iOS) / Create Python Package	15s
Package Toga (toga) / Create Python Package	18s
Package Toga (textual) / Create Python Package	25s
Package Toga (web) / Create Python Package	15s
Package Toga (winforms) / Create Python Package	15s
MicroPython compatibility	35s
Test core (macos-latest, 3.9)	1m 22s
Test core (macos-latest, 3.10)	57s
Test core (macos-latest, 3.11)	43s
Test core (macos-latest, 3.12)	46s
Test core (macos-latest, 3.13)	50s
Test core (ubuntu-latest, 3.9)	53s
Test core (ubuntu-latest, 3.10)	53s
Test core (ubuntu-latest, 3.11)	52s
Test core (ubuntu-latest, 3.12)	1m 11s
Test core (ubuntu-latest, 3.13)	1m 10s
Test core (windows-latest, 3.9)	1m 39s
Test core (windows-latest, 3.10)	1m 41s
Test core (windows-latest, 3.11)	1m 41s
Test core (windows-latest, 3.12)	1m 48s
Test core (windows-latest, 3.13)	2m 11s
Coverage	37s
Testbed (macOS-x86_64)	5m 25s
Testbed (macOS-arm64)	3m 10s
Testbed (windows)	6m 11s
Testbed (linux-x11)	3m 45s
Testbed (linux-wayland)	4m 24s
Testbed (android)	7m 46s
Testbed (iOS)	4m 43s
Testbed (textual-linux)	56s
Testbed (textual-macOS)	1m 17s
Testbed (textual-windows)	1m 58s
	1h 4m 1s

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