Apply strictNullChecks to src/components/views/voip/* (#10692) #14830

Job	Run time
Typescript Syntax Check	5m 49s
ESLint	2m 13s
Rethemendex Check	6s
Typescript Strict Error Checker	0s
Analyse Dead Code	2m 3s
Style Lint	47s
i18n Check / check	55s
	11m 53s

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