Added conformance tests step to CI workflow #11

Job	Run time
Conformance Tests (macos-latest)	18s
Conformance Tests (ubuntu-latest)	49s
Security Scan	27s
Build and Test (ubuntu-latest, 9.0.x)	38s
Lint/Format Check	42s
Build and Test (macos-latest, 9.0.x)	34s
	3m 28s

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