chore(miscellaneous): update demo flags from js to ts (#12197) #2961

Job	Run time
Documentation / Build, test & deploy	4m 42s
CI / Build	2m 32s
CI / Lint	58s
CI / Unit tests	1m 39s
CI / Build demo app	1m 39s
CI / Integration tests	1s
Deploy release	1s
	11m 32s

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