Decoupled winforms event loop from AppContext. #4017

Job	Run time
Check towncrier / Towncrier Checks	35s
Pre-commit checks / Pre-commit Checks	42s
Python Package (android) / Create Python Package	59s
Python Package (cocoa) / Create Python Package	59s
Python Package (demo) / Create Python Package	59s
Python Package (core) / Create Python Package	1m 6s
Python Package (dummy) / Create Python Package	55s
Python Package (gtk) / Create Python Package	56s
Python Package (iOS) / Create Python Package	59s
Python Package (textual) / Create Python Package	57s
Python Package (toga) / Create Python Package	59s
Python Package (web) / Create Python Package	1m 1s
Python Package (winforms) / Create Python Package	1m 1s
core (macos, 3.8)	44s
core (macos, 3.9)	1s
core (macos, 3.10)	48s
core (macos, 3.11)	38s
core (macos, 3.12-dev)	36s
core (ubuntu, 3.8)	47s
core (ubuntu, 3.9)	37s
core (ubuntu, 3.10)	36s
core (ubuntu, 3.11)	49s
core (ubuntu, 3.12-dev)	49s
core (windows, 3.8)	46s
core (windows, 3.9)	47s
core (windows, 3.10)	41s
core (windows, 3.11)	45s
core (windows, 3.12-dev)	40s
Combine & check core coverage.	0s
testbed	0s
backend	0s
	22m 12s

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