Remove unused jest-when dev dependency from scaffolder-backend-module-rails

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Fredrik Adelöw <freben@spotify.com>

yarn.lock

@@ -6755,7 +6755,6 @@ __metadata:
     "@types/node": "npm:^22.13.14"
     command-exists: "npm:^1.2.9"
     fs-extra: "npm:^11.0.0"
-    jest-when: "npm:^3.1.0"
     yaml: "npm:^2.0.0"
   languageName: unknown
   linkType: soft
@@ -35664,15 +35663,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"jest-when@npm:^3.1.0":
-  version: 3.7.0
-  resolution: "jest-when@npm:3.7.0"
-  peerDependencies:
-    jest: ">= 25"
-  checksum: 10/b5b88d077ed467aab220c71c885dbc5f448604f06e68f761ce9f479c99bb74e0dbf553d1cc980751d88401b034a578e1c44eec5e4095743b7586f02bb7c6313d
-  languageName: node
-  linkType: hard
-
 "jest-worker@npm:30.2.0":
   version: 30.2.0
   resolution: "jest-worker@npm:30.2.0"