test: Fix bad caching of gomegas

Caching a gomega instance caused an invalid reuse of testing.T instances

Author: stroiman

internal/testing/gosttest/gomega_suite.go

@@ -11,15 +11,11 @@ import (
 // automatically initializes gomega with
 type GomegaSuite struct {
 	suite.Suite
-	gomega gomega.Gomega
 }
 
 // Expect is wraps [gomega/Gomega.Expect], passing the correct [testing/T]. This
 // supports gomega matchers for verification; which can in some cases provide
 // more expressive tests.
 func (s *GomegaSuite) Expect(actual interface{}, extra ...interface{}) types.Assertion {
-	if s.gomega == nil {
-		s.gomega = gomega.NewWithT(s.T())
-	}
-	return s.gomega.Expect(actual, extra...)
+	return gomega.NewWithT(s.T()).Expect(actual, extra...)
 }