Added conformance tests step to CI workflow #14

Job	Run time
Lint/Format Check	37s
Build and Test (macos-latest, 9.0.x)	29s
Build and Test (ubuntu-latest, 9.0.x)	39s
Security Scan	26s
Conformance Tests (ubuntu-latest, linux_amd64)	30s
Conformance Tests (macos-latest, darwin_arm64)	38s
	3m 19s

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