Fix implicit conversion in expressions like `C ? P : null` #2709

Job	Run time
JS unit tests	2m 6s
.NET unit tests (ubuntu-latest)	4m 2s
Build all projects without errors	11m 0s
Build published projects without warnings (Release)	2m 43s
.NET unit tests (windows-2022)	12m 43s
Build published projects without warnings (Debug)	2m 29s
UI tests (chrome, ubuntu-latest, Production, Default)	19m 35s
UI tests (chrome, windows-2022, Development, Default)	29m 42s
.NET unit tests (macOS-latest)	7m 18s
UI tests (firefox, ubuntu-latest, Development, Default)	24m 57s
UI tests (firefox, ubuntu-latest, Production, Default)	23m 14s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	26m 22s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	16m 58s
	3h 3m 9s

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