search-backend-module-catalog: filter can be array in config schema

Signed-off-by: Jesper Vahlstrup Madsen <jvm@danskecommodities.com>

.changeset/smart-planes-march.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-search-backend-module-catalog': patch
+---
+
+Allow filter to be an array in config schema

plugins/search-backend-module-catalog/config.d.ts

@@ -36,7 +36,7 @@ export interface Config {
          *
          * Defaults to no filter, ie indexing all entities.
          */
-        filter?: object;
+        filter?: object | object[];
         /**
          * The number of entities to process at a time. Keep this at a
          * reasonable number to avoid overloading either the catalog or the