[linguist-backend] no longer skip initial batch

Fixes #16370

Co-authored-by: Jason Nguyen <jsn.dev@outlook.com>
Co-authored-by: Thomas Camargo <camargothomas@gmail.com>

Signed-off-by: Jason Nguyen <jsn.dev@outlook.com>
Signed-off-by: Thomas Camargo <camargothomas@gmail.com>
Signed-off-by: Elizabeth Hobbs <elizabeth.hobbs94@gmail.com>

.changeset/slimy-lobsters-kneel.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-linguist-backend': patch
+---
+
+Fixed bug in LinguistBackendApi that caused initial batch of entities to be skipped.

plugins/linguist-backend/src/api/LinguistBackendApi.ts

@@ -114,6 +114,7 @@ export class LinguistBackendApi {
     );
 
     const entities = entitiesOverview.filteredEntities.slice(
+      0,
       this.batchSize ?? 20,
     );
     entities.forEach(async entityRef => {