Revert v1.17 release changes on v1.16 branch (#18123)

This reverts commits:
  1131f8603e.
  cf5b8b200c.
  75de70a431.
  dff2f7b960.
  cf925bb688.
  ffd1363c0e.
  87a2cafb20.
  ffe259d6f2.

content/ja/examples/examples_test.go

@@ -543,6 +543,8 @@ func TestExampleObjectSchemas(t *testing.T) {
 	capabilities.SetForTests(capabilities.Capabilities{
 		AllowPrivileged: true,
 	})
+	// PodShareProcessNamespace needed for example share-process-namespace.yaml
+	utilfeature.DefaultFeatureGate.Set("PodShareProcessNamespace=true")
 
 	for dir, expected := range cases {
 		tested := 0