event_loop: remove generic user event #6347

Job	Run time
Minimize JavaScript	10s
Check formatting	11s
Run cargo-deny on Android	21s
Run cargo-deny on iOS	20s
Check for typos	3s
Run cargo-deny on Linux	20s
Test stable Windows 64bit MSVC	2m 1s
Run cargo-deny on macOS	19s
Test stable Windows 32bit MSVC	2m 48s
Run cargo-deny on Redox OS	20s
Test stable Windows 64bit GNU	2m 22s
Run cargo-deny on web	19s
Test stable Windows 32bit GNU	2m 20s
Run cargo-deny on Windows	21s
Test stable Linux 32bit	2m 8s
Test stable Linux 64bit	1m 51s
Test stable X11	1m 31s
Test stable Wayland	1m 35s
Test stable Android	1m 10s
Test stable Redox OS	21s
Test stable macOS	1m 7s
Test stable iOS x86_64	52s
Test stable iOS Aarch64	49s
Test stable web	58s
Test nightly Windows 64bit MSVC	1m 36s
Test nightly Windows 32bit MSVC	1m 43s
Test nightly Windows 64bit GNU	2m 8s
Test nightly Windows 32bit GNU	2m 5s
Test nightly Linux 32bit	1m 58s
Test nightly Linux 64bit	1m 31s
Test nightly X11	1m 33s
Test nightly Wayland	1m 28s
Test nightly Android	1m 14s
Test nightly Redox OS	29s
Test nightly macOS	56s
Test nightly iOS x86_64	59s
Test nightly iOS Aarch64	1m 12s
Test nightly web	1m 6s
Test 1.73 Windows 64bit MSVC	1m 4s
Test 1.73 Windows 32bit MSVC	1m 0s
Test 1.73 Windows 64bit GNU	1m 2s
Test 1.73 Windows 32bit GNU	1m 12s
Test 1.73 Linux 32bit	1m 21s
Test 1.73 Linux 64bit	55s
Test 1.73 X11	47s
Test 1.73 Wayland	46s
Test 1.73 Redox OS	20s
Test 1.73 macOS	45s
Test 1.73 iOS x86_64	36s
Test 1.73 iOS Aarch64	35s
Test 1.73 web	48s
Test 1.73 Android	40s
Test nightly web Atomic	1m 26s
	57m 52s

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