Tests

Replace getJson call with async code and remove more callbacks #2671

Job	Run time
Build tests (ubuntu-latest)	44s
Render tests (ubuntu-latest, 0)	1m 6s
Build tests (windows-latest)	46s
Integration tests (ubuntu-latest)	54s
Code Hygiene	1m 19s
Render tests (ubuntu-latest, 1)	54s
Integration tests (windows-latest)	59s
Unit tests and Coverage (ubuntu-latest)	43s
Render tests (windows-latest, 0)	21m 27s
Render tests (windows-latest, 1)	15m 43s
Render tests (windows-latest, 2)	14m 37s
	59m 12s

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