Add ability replace the built in entity processors

Signed-off-by: Brian Fletcher <brian@roadie.io>

plugins/catalog-backend/config.d.ts

@@ -148,6 +148,15 @@ export interface Config {
      */
     disableRelationsCompatibility?: boolean;
 
+    /**
+     * Disables the default backstage processors.
+     *
+     * Enabling this option allows more complete control of which processors are included
+     * in the backstage processing loop.
+     *
+     */
+    disableDefaultProcessors?: boolean;
+
     /**
      * The strategy to use for entities that are orphaned, i.e. no longer have
      * any other entities or providers referencing them. The default value is

plugins/catalog-backend/src/service/CatalogBuilder.ts

@@ -736,8 +736,14 @@ export class CatalogBuilder {
       processors.push(builtinKindsEntityProcessor);
     }
 
-    // These are only added unless the user replaced them all
-    if (!this.processorsReplace) {
+    const disableDefaultProcessors = config.getOptionalBoolean(
+      'catalog.disableDefaultProcessors',
+    );
+
+    // Add default processors if:
+    // - processors have NOT been explicitly replaced
+    // - and default processors are NOT disabled via config
+    if (!this.processorsReplace && !disableDefaultProcessors) {
       processors.push(...this.getDefaultProcessors());
     }