feat: make default value optional for ValueSignal (#3160) #8619

Job	Run time
Build Java and TypeScript for other tasks	2m 32s
Test Java	3m 27s
Gradle tests (ubuntu-latest)	3m 40s
Check style	1m 58s
Gradle tests (windows-latest)	7m 44s
ITs (ubuntu-latest, group-1)	5m 51s
ITs (ubuntu-latest, group-2)	4m 25s
Test TypeScript	2m 32s
ITs (ubuntu-latest, some)	4m 49s
Tests Summary	2s
	37m 0s

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