ci(amplify-category-api-e2e-tests): add throwaway buildspec for RDS revert [#3449]

Runs only the 4 affected RDS groups + prerequisites. Remove before merge.

Author: Simone319

codebuild_specs/verify_rds_assertions.yml

@@ -0,0 +1,62 @@
+# throwaway buildspec to verify the reverted VPC-endpoint assertion [#3449]
+# runs ONLY the 4 affected RDS groups + their prerequisites (build_linux, publish_to_local_registry).
+# blocks copied verbatim from codebuild_specs/e2e_workflow_api_gql.yml. do not regenerate.
+version: 0.2
+env:
+  shell: bash
+  compute-type: BUILD_GENERAL1_MEDIUM
+  variables:
+    JSII_DEPRECATED: quiet
+batch:
+  fast-fail: false
+  build-graph:
+    - identifier: build_linux
+      buildspec: codebuild_specs/build_linux.yml
+      env:
+        compute-type: BUILD_GENERAL1_LARGE
+    - identifier: publish_to_local_registry
+      buildspec: codebuild_specs/publish_to_local_registry.yml
+      env:
+        compute-type: BUILD_GENERAL1_MEDIUM
+      depend-on:
+        - build_linux
+    - identifier: rds_pg_model_v2
+      buildspec: codebuild_specs/run_e2e_tests.yml
+      env:
+        compute-type: BUILD_GENERAL1_MEDIUM
+        variables:
+          NODE_OPTIONS: '--max-old-space-size=6656 --experimental-vm-modules'
+          TEST_SUITE: src/__tests__/rds-pg-model-v2.test.ts
+          CLI_REGION: eu-west-3
+      depend-on:
+        - publish_to_local_registry
+    - identifier: rds_pg_import
+      buildspec: codebuild_specs/run_e2e_tests.yml
+      env:
+        compute-type: BUILD_GENERAL1_MEDIUM
+        variables:
+          NODE_OPTIONS: '--max-old-space-size=6656 --experimental-vm-modules'
+          TEST_SUITE: src/__tests__/rds-pg-import.test.ts
+          CLI_REGION: us-east-1
+      depend-on:
+        - publish_to_local_registry
+    - identifier: rds_pg_array_objects
+      buildspec: codebuild_specs/run_e2e_tests.yml
+      env:
+        compute-type: BUILD_GENERAL1_MEDIUM
+        variables:
+          NODE_OPTIONS: '--max-old-space-size=6656 --experimental-vm-modules'
+          TEST_SUITE: src/__tests__/rds-pg-array-objects.test.ts
+          CLI_REGION: eu-central-1
+      depend-on:
+        - publish_to_local_registry
+    - identifier: rds_mysql_model_v2
+      buildspec: codebuild_specs/run_e2e_tests.yml
+      env:
+        compute-type: BUILD_GENERAL1_MEDIUM
+        variables:
+          NODE_OPTIONS: '--max-old-space-size=6656 --experimental-vm-modules'
+          TEST_SUITE: src/__tests__/rds-mysql-model-v2.test.ts
+          CLI_REGION: us-west-2
+      depend-on:
+        - publish_to_local_registry