fix(filmstrip) Excludes partially visible tiles for dominant speaker slot. #15839

Job	Run time
Build mobile bundle (iOS)	5m 3s
Lint	2m 46s
Build mobile SDK (Android)	19m 17s
Build Frontend (ubuntu-latest)	5m 4s
Build Frontend (macos-latest)	15m 28s
Build mobile SDK (iOS)	35m 56s
Test Debian packages build	10m 41s
Build mobile bundle (Android)	2m 44s
	1h 36m 59s

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