Add support for background and session-based apps #6156

Job	Run time
Pre-commit checks / Pre-commit Checks	47s
Check towncrier / Towncrier Checks	36s
Package Toga (cocoa) / Create Python Package	20s
Package Toga (android) / Create Python Package	24s
Package Toga (core) / Create Python Package	22s
Package Toga (demo) / Create Python Package	25s
Package Toga (dummy) / Create Python Package	19s
Package Toga (gtk) / Create Python Package	26s
Package Toga (iOS) / Create Python Package	17s
Package Toga (textual) / Create Python Package	17s
Package Toga (toga) / Create Python Package	24s
Package Toga (web) / Create Python Package	17s
Package Toga (winforms) / Create Python Package	17s
Test core (macos-12, 3.8)	1m 47s
Test core (macos-12, 3.12)	1m 17s
Test core (macos-12, 3.13-dev)	1m 10s
Test core (macos-14, 3.12)	42s
Test core (macos-14, 3.13-dev)	39s
Test core (ubuntu-latest, 3.8)	54s
Test core (ubuntu-latest, 3.12)	1m 0s
Test core (ubuntu-latest, 3.13-dev)	30s
Test core (windows-latest, 3.8)	1m 39s
Test core (windows-latest, 3.12)	1m 44s
Test core (ubuntu-latest, 3.9, false)	50s
Test core (ubuntu-latest, 3.10, false)	53s
Test core (ubuntu-latest, 3.11, false)	59s
Coverage	30s
Testbed (macOS-x86_64)	4m 17s
Testbed (macOS-arm64)	2m 42s
Testbed (windows)	5m 14s
Testbed (linux-x11)	2m 46s
Testbed (linux-wayland)	2m 59s
Testbed (android)	7m 18s
Testbed (iOS)	7m 33s
	52m 34s

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