JsComponent: improve error reporting and doccomments #2969

Job	Run time
Build all projects without errors	12m 5s
.NET unit tests (ubuntu-latest)	1m 47s
Build published projects without warnings (Release)	3m 7s
.NET unit tests (windows-2022)	6m 43s
JS unit tests	1m 1s
Build published projects without warnings (Debug)	3m 47s
.NET unit tests (macOS-latest)	4m 57s
UI tests (chrome, ubuntu-latest, Production, Default)	12m 54s
UI tests (chrome, windows-2022, Development, Default)	28m 32s
UI tests (firefox, ubuntu-latest, Development, Default)	18m 52s
UI tests (firefox, ubuntu-latest, Production, Default)	19m 16s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	18m 24s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	14m 11s
	2h 25m 36s

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