fix: restrict entities to component

Signed-off-by: Diana Janickova <djanicko@redhat.com>

Author: djanickova

workspaces/scorecard/.changeset/dirty-symbols-mate.md

@@ -0,0 +1,5 @@
+---
+'@red-hat-developer-hub/backstage-plugin-scorecard-backend-module-filecheck': patch
+---
+
+Restrict filecheck metric collection to Component catalog entities by adding a kind: component catalog filter.

workspaces/scorecard/plugins/scorecard-backend-module-filecheck/README.md

@@ -75,7 +75,7 @@ If no files are configured, no metrics are registered and the module has no effe
 
 ### Entity Requirements
 
-Entities must have the `backstage.io/source-location` annotation set (typically added automatically by the catalog ingestion process):
+Only **Component** entities are checked. They must have the `backstage.io/source-location` annotation set (typically added automatically by the catalog ingestion process):
 
 ```yaml
 # catalog-info.yaml

workspaces/scorecard/plugins/scorecard-backend-module-filecheck/src/metricProviders/FilecheckMetricProvider.test.ts

@@ -274,6 +274,7 @@ describe('FilecheckMetricProvider', () => {
 
     it('should return correct catalog filter', () => {
       expect(provider?.getCatalogFilter()).toEqual({
+        kind: 'component',
         'metadata.annotations.backstage.io/source-location': expect.any(Symbol),
       });
     });

workspaces/scorecard/plugins/scorecard-backend-module-filecheck/src/metricProviders/FilecheckMetricProvider.ts

@@ -72,6 +72,7 @@ export class FilecheckMetricProvider implements MetricProvider<'boolean'> {
 
   getCatalogFilter(): Record<string, string | symbol | (string | symbol)[]> {
     return {
+      kind: 'component',
       'metadata.annotations.backstage.io/source-location':
         CATALOG_FILTER_EXISTS,
     };