Adding removal_errors to feature_support that has edition_removed. This is now a requirement new parser change (cl/838888348)

PiperOrigin-RevId: 843843776

Author: karenwuz

src/google/protobuf/unittest_custom_features.proto

@@ -50,6 +50,7 @@ enum ValueLifetimeFeature {
     edition_deprecated: EDITION_99998_TEST_ONLY
     deprecation_warning: "Custom feature deprecation warning"
     edition_removed: EDITION_99999_TEST_ONLY
+    removal_error: "Custom feature removal error"
   }];
   VALUE_LIFETIME_EMPTY_SUPPORT = 3 [feature_support = {}];
   VALUE_LIFETIME_FUTURE = 4
@@ -60,6 +61,7 @@ enum ValueLifetimeFeature {
   }];
   VALUE_LIFETIME_REMOVED = 6 [feature_support = {
     edition_deprecated: EDITION_2023
+    deprecation_warning: "Custom feature deprecation warning"
     edition_removed: EDITION_99997_TEST_ONLY
     removal_error: "Custom feature removal error"
   }];

src/google/protobuf/unittest_features.proto

@@ -63,6 +63,7 @@ enum ValueLifetimeFeature {
     edition_deprecated: EDITION_99998_TEST_ONLY
     deprecation_warning: "Custom feature deprecation warning"
     edition_removed: EDITION_99999_TEST_ONLY
+    removal_error: "Custom feature removal error"
   }];
   VALUE_LIFETIME_EMPTY_SUPPORT = 3 [feature_support = {}];
   VALUE_LIFETIME_FUTURE = 4
@@ -73,6 +74,7 @@ enum ValueLifetimeFeature {
   }];
   VALUE_LIFETIME_REMOVED = 6 [feature_support = {
     edition_deprecated: EDITION_2023
+    deprecation_warning: "Custom feature deprecation warning"
     edition_removed: EDITION_99997_TEST_ONLY
     removal_error: "Custom feature removal error"
   }];