Add polling based window waiting for testbed #7485

Job	Run time
Pre-commit checks / Pre-commit Checks	38s
Check towncrier / Towncrier Checks	36s
Package Toga (android) / Create Python Package	15s
Package Toga (cocoa) / Create Python Package	24s
Package Toga (core) / Create Python Package	24s
Package Toga (demo) / Create Python Package	17s
Package Toga (dummy) / Create Python Package	17s
Package Toga (gtk) / Create Python Package	23s
Package Toga (iOS) / Create Python Package	24s
Package Toga (textual) / Create Python Package	22s
Package Toga (toga) / Create Python Package	23s
Package Toga (web) / Create Python Package	13s
Package Toga (winforms) / Create Python Package	14s
MicroPython compatibility	35s
Test core (macos-latest, 3.9)	1m 7s
Test core (macos-latest, 3.10)	1m 16s
Test core (macos-latest, 3.11)	58s
Test core (macos-latest, 3.12)	51s
Test core (macos-latest, 3.13)	49s
Test core (ubuntu-latest, 3.9)	53s
Test core (ubuntu-latest, 3.10)	58s
Test core (ubuntu-latest, 3.11)	1m 0s
Test core (ubuntu-latest, 3.12)	1m 4s
Test core (ubuntu-latest, 3.13)	1m 20s
Test core (windows-latest, 3.9)	1m 35s
Test core (windows-latest, 3.10)	1m 53s
Test core (windows-latest, 3.11)	1m 51s
Test core (windows-latest, 3.12)	1m 55s
Test core (windows-latest, 3.13)	2m 15s
Coverage	28s
Testbed (macOS-x86_64)	8m 23s
Testbed (macOS-arm64)	6m 52s
Testbed (windows)	8m 19s
Testbed (linux-x11)	6m 7s
Testbed (linux-wayland)	6m 14s
Testbed (android)	9m 20s
Testbed (iOS)	6m 18s
Testbed (textual-linux)	51s
Testbed (textual-macOS)	59s
Testbed (textual-windows)	1m 58s
	1h 20m 59s

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