[FSTORE-1633] Fix engine choice in case of connection to serverless #735

Job	Run time
Lint and Stylecheck	8s
Unit Tests (Local TZ)	2m 54s
Unit Tests (No Optional Dependencies)	2m 5s
Unit Tests (3.8)	2m 31s
Unit Tests (Pandas 1.x)	2m 9s
Unit Tests (3.9)	2m 34s
Unit Tests (Typechecked)	1m 19s
Unit Tests (3.10)	2m 50s
Unit Tests (Windows)	8m 2s
Unit Tests (Windows) (Local TZ)	10m 11s
	34m 43s

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