add missing jest peer deps

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/test-utils-jest-peer-dep.md

@@ -0,0 +1,6 @@
+---
+'@backstage/test-utils': patch
+'@backstage/backend-test-utils': patch
+---
+
+Added `@types/jest` as an optional peer dependency, since jest types are exposed in the public API surface.

packages/backend-test-utils/package.json

@@ -88,5 +88,13 @@
     "@types/lodash": "^4.14.151",
     "@types/supertest": "^2.0.8",
     "supertest": "^7.0.0"
+  },
+  "peerDependencies": {
+    "@types/jest": "*"
+  },
+  "peerDependenciesMeta": {
+    "@types/jest": {
+      "optional": true
+    }
   }
 }

packages/test-utils/package.json

@@ -74,12 +74,16 @@
   },
   "peerDependencies": {
     "@testing-library/react": "^16.0.0",
+    "@types/jest": "*",
     "@types/react": "^17.0.0 || ^18.0.0",
     "react": "^17.0.0 || ^18.0.0",
     "react-dom": "^17.0.0 || ^18.0.0",
     "react-router-dom": "^6.30.2"
   },
   "peerDependenciesMeta": {
+    "@types/jest": {
+      "optional": true
+    },
     "@types/react": {
       "optional": true
     }

yarn.lock

@@ -3207,6 +3207,11 @@ __metadata:
     yn: "npm:^4.0.0"
     zod: "npm:^3.25.76"
     zod-to-json-schema: "npm:^3.25.1"
+  peerDependencies:
+    "@types/jest": "*"
+  peerDependenciesMeta:
+    "@types/jest":
+      optional: true
   languageName: unknown
   linkType: soft
 
@@ -7974,11 +7979,14 @@ __metadata:
     zen-observable: "npm:^0.10.0"
   peerDependencies:
     "@testing-library/react": ^16.0.0
+    "@types/jest": "*"
     "@types/react": ^17.0.0 || ^18.0.0
     react: ^17.0.0 || ^18.0.0
     react-dom: ^17.0.0 || ^18.0.0
     react-router-dom: ^6.30.2
   peerDependenciesMeta:
+    "@types/jest":
+      optional: true
     "@types/react":
       optional: true
   languageName: unknown