Allow limit=0 on entity query requests

Signed-off-by: Eric Peterson <ericpeterson@spotify.com>

.changeset/catalog-everybody-to-the-limit.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Fix to the `limit` parameter on entity queries.

plugins/catalog-backend/src/schema/openapi.generated.ts

@@ -135,7 +135,7 @@ export const spec = {
         required: false,
         schema: {
           type: 'integer',
-          minimum: 1,
+          minimum: 0,
         },
       },
       orderField: {

plugins/catalog-backend/src/schema/openapi.yaml

@@ -90,7 +90,7 @@ components:
       required: false
       schema:
         type: integer
-        minimum: 1
+        minimum: 0
     orderField:
       name: orderField
       in: query