fix: when multiple http2Rpc config constructHttp2RpcEnvoyFilter (…

[hanxiantao]

Ⅰ. Describe what this PR did

修复两个Http2Rpc转换EnvoyFilter有两个envoy.filters.http.http_dubbo_transcoder的部分的问题

Ⅱ. Does this pull request fix one issue?

Http2Rpc配置两个Http2Rpc，路由转发失败 #926

fixes #926

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

两个Ingress和Http2Rpc的情况

只有一个account Ingress和Http2Rpc的情况

相关配置：

kind: Ingress
apiVersion: networking.k8s.io/v1
metadata:
  name: account-higress
  namespace: higress-system
  labels:
    higress.io/resource-definer: higress
  annotations:
    higress.io/destination: >-
      providers:com.alibaba.edas.boot.AccountService:1.0.0:DUBBO.DEFAULT-GROUP.public.nacos
    higress.io/ignore-path-case: 'false'
    higress.io/rpc-destination-name: account
spec:
  ingressClassName: higress
  rules:
    - http:
        paths:
          - path: /account
            pathType: Prefix
            backend:
              resource:
                apiGroup: networking.higress.io
                kind: McpBridge
                name: default
status:
  loadBalancer: {}
---
kind: Ingress
apiVersion: networking.k8s.io/v1
metadata:
  name: echo-higress
  namespace: higress-system
  labels:
    higress.io/resource-definer: higress
  annotations:
    higress.io/destination: >-
      providers:com.alibaba.edas.boot.EchoService:1.0.0:DUBBO.DEFAULT-GROUP.public.nacos
    higress.io/ignore-path-case: 'false'
    higress.io/rpc-destination-name: echo
spec:
  ingressClassName: higress
  rules:
    - http:
        paths:
          - path: /echo
            pathType: Prefix
            backend:
              resource:
                apiGroup: networking.higress.io
                kind: McpBridge
                name: default
status:
  loadBalancer: {}
---
apiVersion: networking.higress.io/v1
kind: Http2Rpc
metadata:
  name: echo
  namespace: higress-system
spec:
  dubbo:
    group: DUBBO
    methods:
      - httpMethods:
          - GET
        httpPath: /echo/echo
        params:
          - paramKey: p
            paramSource: QUERY
            paramType: java.lang.String
        serviceMethod: echo
    service: com.alibaba.edas.boot.EchoService
    version: 1.0.0
---
apiVersion: networking.higress.io/v1
kind: Http2Rpc
metadata:
  name: account
  namespace: higress-system
spec:
  dubbo:
    group: DUBBO
    methods:
      - httpMethods:
          - GET
        httpPath: /account/name
        params:
          - paramKey: p
            paramSource: QUERY
            paramType: java.lang.String
        serviceMethod: name
    service: com.alibaba.edas.boot.AccountService
    version: 1.0.0

Ⅴ. Special notes for reviews

[johnlanni]

LGTM