api-extractor: warn about unnecessarily allowing warnings

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

scripts/api-extractor.ts

@@ -241,7 +241,6 @@ const ALLOW_WARNINGS = [
   'plugins/kafka',
   'plugins/kafka-backend',
   'plugins/kubernetes',
-  'plugins/kubernetes-backend',
   'plugins/kubernetes-common',
   'plugins/lighthouse',
   'plugins/newrelic',
@@ -566,6 +565,11 @@ async function runApiExtraction({
         `The API Report for ${packageDir} is not allowed to have warnings`,
       );
     }
+    if (warningCountAfter === 0 && ALLOW_WARNINGS.includes(packageDir)) {
+      console.log(
+        `No need to allow warnings for ${packageDir}, it does not have any`,
+      );
+    }
     if (warningCountAfter > warningCountBefore) {
       warnings.push(
         `The API Report for ${packageDir} introduces new warnings. ` +