Relax event requirement for a flaky test

When the subscription has a ConstraintsNotSatisfiable condition, the
exact content of the message is not always consistent. We have added
other things to sort the message better, but it looks like we missed
this test which was still assuming a certain part was first.

Signed-off-by: Justin Kulikauskas <jkulikau@redhat.com>

test/e2e/case38_install_operator_test.go

@@ -704,7 +704,7 @@ var _ = Describe("Testing OperatorPolicy", Ordered, func() {
  " in the catalog referenced by subscription project-quay-does-not-exist, subscription " +
  "project-quay-does-not-exist exists",
  },
- "constraints not satisfiable: no operators found in package project-quay-does-not-exist",
+ "constraints not satisfiable",
  )
 
  // Check if the subscription is still compliant on the operator policy trying to install a valid operator.