The APIGatewayV2 controller does not accept httpMethod in the Integration custom resource

[Ved-Janardhan-SRT]

Describe the bug
When an Integration CR is created, the controller reports that the httpMethod field is not set, even though a valid value is provided and a correct AWS resource is created.

Steps to reproduce

1. Create a Method CR
2. Create a Integration CR

apiVersion: apigateway.services.k8s.aws/v1alpha1
kind: Method
metadata:
  finalizers:
  - finalizers.apigateway.services.k8s.aws/Method
  name: openid-configuration-get
spec:
  apiKeyRequired: false
  authorizationType: NONE
  httpMethod: GET
  requestParameters:
    method.request.path.tenant: true
  resourceRef:
    from:
      name: openid-configuration-idp-nonprod-auth
  restAPIRef:
    from:
      name: idp-nonprod-auth

apiVersion: apigateway.services.k8s.aws/v1alpha1
kind: Integration
metadata:
  finalizers:
  - finalizers.apigateway.services.k8s.aws/Integration
  name: openid-configuration-get
spec:
  httpMethod: GET
  integrationHTTPMethod: GET
  requestParameters:
    integration.request.path.tenant: method.request.path.tenant
  requestTemplates:
    application/json: |
      {"statusCode": 200}
  resourceRef:
    from:
      name: openid-configuration-idp-nonprod-auth
  restAPIRef:
    from:
      name: idp-nonprod-auth
  type: MOCK

Expected outcome
The controller should not complain about the invalid spec

reason: 'Integration.apigateway.services.k8s.aws "openid-configuration-get" is
  invalid: [spec.httpMethod: Required value, <nil>: Invalid value: "null": some
   validation rules were not checked because the object was invalid; correct the
   existing errors to complete validation]'

Controller logs

{"level":"error","ts":"2025-08-04T00:40:03.657Z","msg":"Reconciler error","controller":"integration","controllerGroup":"apigateway.services.k8s.aws","controllerKind":"Integration","Integration":{"name":"openid-configuration-get","namespace":"keycloak"},"namespace":"keycloak","name":"openid-configuration-get","reconcileID":"35d4bdbb-8f50-4aba-b902-30ad51b95329","error":"Integration.apigateway.services.k8s.aws \"openid-configuration-get\" is invalid: [spec.httpMethod: Required value, <nil>: Invalid value: \"null\": some validation rules were not checked because the object was invalid; correct the existing errors to complete validation]","stacktrace":"sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/internal/controller/controller.go:347\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/internal/controller/controller.go:294\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.2\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/internal/controller/controller.go:255"}
{"level":"info","ts":"2025-08-04T00:44:09.287Z","logger":"ackrt","msg":"desired resource state has changed","kind":"Integration","namespace":"keycloak","name":"openid-configuration-options","account":"487409146247","role":"","region":"eu-west-1","is_adopted":false,"generation":1,"diff":[{"Path":{"Parts":["Spec","HTTPMethod"]},"A":"OPTIONS","B":null},{"Path":{"Parts":["Spec","PassthroughBehavior"]},"A":null,"B":"WHEN_NO_MATCH"},{"Path":{"Parts":["Spec","TimeoutInMillis"]},"A":null,"B":29000}]}
{"level":"error","ts":"2025-08-04T00:44:09.365Z","msg":"Reconciler error","controller":"integration","controllerGroup":"apigateway.services.k8s.aws","controllerKind":"Integration","Integration":{"name":"openid-configuration-options","namespace":"keycloak"},"namespace":"keycloak","name":"openid-configuration-options","reconcileID":"e5ac9e9e-aa2e-4fba-845d-1951c48acf2f","error":"Integration.apigateway.services.k8s.aws \"openid-configuration-options\" is invalid: [spec.httpMethod: Required value, <nil>: Invalid value: \"null\": some validation rules were not checked because the object was invalid; correct the existing errors to complete validation]","stacktrace":"sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/internal/controller/controller.go:347\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/internal/controller/controller.go:294\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.2\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/internal/controller/controller.go:255"}

Environment

• Kubernetes version: v1.32.5
• Using EKS (yes/no), if so version?: Yes , v1.32.5-eks-5d4a308
• AWS service targeted (S3, RDS, etc.): API Gateway v2

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