Decoupled winforms event loop from AppContext. #4056

Job	Run time
Check towncrier / Towncrier Checks	30s
Pre-commit checks / Pre-commit Checks	40s
Python Package (demo) / Create Python Package	1m 14s
Python Package (core) / Create Python Package	1m 8s
Python Package (android) / Create Python Package	1m 3s
Python Package (cocoa) / Create Python Package	1m 4s
Python Package (dummy) / Create Python Package	1m 20s
Python Package (gtk) / Create Python Package	1m 6s
Python Package (iOS) / Create Python Package	1m 14s
Python Package (textual) / Create Python Package	1m 19s
Python Package (toga) / Create Python Package	59s
Python Package (web) / Create Python Package	1m 14s
Python Package (winforms) / Create Python Package	55s
core (macos, 3.8)	1m 20s
core (macos, 3.9)	58s
core (macos, 3.10)	1m 11s
core (macos, 3.11)	1m 8s
core (macos, 3.12-dev)	2m 18s
core (ubuntu, 3.8)	56s
core (ubuntu, 3.9)	54s
core (ubuntu, 3.10)	49s
core (ubuntu, 3.11)	44s
core (ubuntu, 3.12-dev)	1m 16s
core (windows, 3.8)	1m 36s
core (windows, 3.9)	3m 0s
core (windows, 3.10)	1m 48s
core (windows, 3.11)	1m 39s
core (windows, 3.12-dev)	3m 23s
backend (android)	46s
backend (cocoa)	1m 16s
backend (gtk)	1m 27s
backend (iOS)	51s
Combine & check core coverage.	19s
backend (web)	26s
testbed (macOS)	2m 46s
backend (winforms)	1m 26s
testbed (windows)	4m 43s
testbed (linux)	2m 41s
testbed (android)	25m 41s
testbed (iOS)	6m 25s
	1h 25m 33s

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