Update CI to support integration tests

[MrAlias]

In both the mongo and cassandra instrumentation the testing requires and actual database:

• opentelemetry-go-contrib/instrumentation/go.mongodb.org/mongo-driver/mongo_test.go

  Lines 33 to 40 in 2baa898

  	func TestMain(m *testing.M) {
  	_, ok := os.LookupEnv("INTEGRATION")
  	if !ok {
  	fmt.Println("--- SKIP: to enable integration test, set the INTEGRATION environment variable")
  	os.Exit(0)
  	}
  	os.Exit(m.Run())
  	}

• Add instrumentation for github.com/gocql/gocql #137 (comment)

Our current CI system does not stand any of these up so the testing is currently disabled. We should automate some form of testing to work with the CI system that supports these tests.

[reggiemcdonald]

I would be interested in getting the tests running for mongo and gocql!