Factor out chatView.scrollTimer to ScrollFinisher #589

Job	Run time
Prepare	2s
Build (ubuntu-22.04, 6, own-quotient)	4m 52s
Build (ubuntu-22.04, 6, static)	3m 34s
Build (ubuntu-22.04, 6, dynamic)	3m 25s
Build (ubuntu-22.04, 6, GCC, own-quotient)	7m 26s
Build (ubuntu-22.04, 6, GCC, static)	7m 27s
Build (ubuntu-22.04, 6, GCC, dynamic)	6m 2s
Build (macos-latest, 6, own-quotient)	7m 26s
Build (macos-latest, 6, static)	6m 42s
Build (windows-latest, 6, own-quotient)	7m 13s
Build (windows-latest, 6, static)	4m 33s
Build (ubuntu-22.04, 5, own-quotient, appstream)	5m 10s
Build (ubuntu-22.04, 5, static)	3m 52s
Build (ubuntu-22.04, 5, dynamic, codeql)	7m 25s
Publish	1s
	1h 15m 10s

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