CDAP-5884 add explicit spark dependency to cdap-integration-test
CDAP-5884 add explicit spark dependency to cdap-integration-test

When the dist profile is used, the dependency on cdap-spark-core
in cdap-standalone is set to provided scope, which is intended.
Dependencies of provided dependencies are not included by newer
versions of maven, so cdap-spark-core is not getting picked up
during sdk builds. Adding it explicitly fixes the error.

caskdata/cdap,caskdata/cdap,caskdata/cdap,caskdata/cdap,caskdata/cdap,caskdata/cdap