fix(ci): run npm test instead of hardcoded npx jest in ci-typescript-cdk

.github/workflows/ci-typescript-cdk.yaml

@@ -32,7 +32,7 @@ on:
         type: boolean
         default: false
       run-tests:
-        description: "Run Jest"
+        description: "Run the package's npm test script (requires a test script in package.json)"
         type: boolean
         default: false
       run-cdk-synth:
@@ -104,7 +104,7 @@ jobs:
       - name: Run tests
         if: ${{ inputs.run-tests }}
         working-directory: ${{ inputs.working-directory }}
-        run: npx jest
+        run: npm test
 
       - name: CDK synth
         if: ${{ inputs.run-cdk-synth }}