Refactor the PrefixSuffixTransformer into separate prefix- and suffix transformers (#4318)

* Refactor prefix filter into its own filter, decoupled from the prefixsuffix filter

* Refactor prefix transformer into its own transformer, decoupled from the prefixsuffix transformer

* Refactor suffix filter into its own filter, decoupled from the prefixsuffix filter

* Refactor suffix transformer into its own transformer, decoupled from the prefixsuffix transformer

* Add a default nameSuffix field spec in addition to the namePrefix

* Remove the PrefixSuffixTransformer from the list of builtin transformers

* Add a multi-transformer to builtinhelpers.TransformFactories

* Remove the implementation of the prefixsuffixtransformer.PrefixSuffixTransformer

* Resolve style and format related feedback from the pull request

* Add test to test the legacy PrefixSuffixTransformer for BC purposes

api/krusty/customconfigreusable_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+	"sigs.k8s.io/kustomize/api/types"
 )
 
 // Demo custom configuration as a base.
@@ -15,9 +16,9 @@ import (
 // kustomizations.
 func TestReusableCustomTransformers(t *testing.T) {
 	th := kusttest_test.MakeEnhancedHarness(t).
-		PrepBuiltin("PrefixSuffixTransformer").
 		PrepBuiltin("AnnotationsTransformer").
 		PrepBuiltin("LabelTransformer")
+	th.GetPluginConfig().BpLoadingOptions = types.BploUseStaticallyLinked
 	defer th.Reset()
 
 	// First write three custom configurations for builtin plugins.