Revert "disable backwards-5.0 tests as there is no BWC layer in the seq# related components"

This reverts commit db87837c72a2659cd739eca88a0314c9342338fa.

qa/backwards-5.0/build.gradle

@@ -23,8 +23,6 @@ integTest {
   }
 }
 
-integTest.enabled = false // bwc need to be disabled until we build a BWC layer into seq# components
-
 repositories {
   maven {
     url "https://oss.sonatype.org/content/repositories/snapshots/"