Added conformance tests step to CI workflow #15

Job	Run time
Lint/Format Check	30s
Build and Test (ubuntu-latest, 9.0.x)	37s
Build and Test (macos-latest, 9.0.x)	28s
Security Scan	27s
Conformance Tests (macos-latest, darwin_arm64)	21s
Conformance Tests (ubuntu-latest, linux_amd64)	29s
	2m 52s

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