JsComponent: improve error reporting and doccomments #2971

Job	Run time
Build all projects without errors	8m 38s
Build published projects without warnings (Release)	2m 51s
JS unit tests	58s
Build published projects without warnings (Debug)	3m 13s
.NET unit tests (ubuntu-latest)	2m 11s
.NET unit tests (windows-2022)	5m 35s
UI tests (chrome, ubuntu-latest, Production, Default)	13m 43s
.NET unit tests (macOS-latest)	5m 50s
UI tests (chrome, windows-2022, Development, Default)	23m 58s
UI tests (firefox, ubuntu-latest, Development, Default)	21m 52s
UI tests (firefox, ubuntu-latest, Production, Default)	17m 43s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	20m 32s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	13m 16s
	2h 20m 20s

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