preallocate memory

**What this PR does / why we need it:**

Preallocate memory instead of enforcing an incremental growth. This will result in less work for the garbage collector.

pkg/termination/parse.go

@@ -53,7 +53,7 @@ func ParseMessage(logger *zap.SugaredLogger, msg string) ([]v1beta1.PipelineReso
 	for _, rr := range r {
 		m[rr.Key] = rr
 	}
-	var r2 []v1beta1.PipelineResourceResult
+	r2 := make([]v1beta1.PipelineResourceResult, 0, len(m))
 	for _, v := range m {
 		r2 = append(r2, v)
 	}