envoy: fix proxy-wasm memleak&ppv2 port mapping

[johnlanni]

Ⅰ. Describe what this PR did

Fixed two issues with envoy:

1. There was a memory leak in proxy-wasm-cpp-host, which became noticeable with larger plugin configurations as the memory leak increased with each plugin configuration update.
2. When ppv2 is enabled and the port of the upper-layer proxy does not match the envoy port, sRDS using the port before mapping to find the routing table would cause a 404 issue.

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[lingma-agents]

升级 Envoy 和 Istio 子模块版本

变更概述

• 依赖更新
  • 更新了 envoy/envoy 子模块至提交 e2707255f18baa841e723e85f7b7ea13ea93c2e5
  • 更新了 istio/istio 子模块至提交 fa8896cf3372218cf41b9b2b37c9134aae88874c
  • 此次更新可能包含对 proxy-wasm 内存泄漏修复以及 ppv2 端口映射问题的修复（根据 PR 标题推测）

变更文件

文件路径	变更说明
envoy/envoy	将 Envoy 子模块更新到新的提交哈希。
istio/istio	将 Istio 子模块更新到新的提交哈希。

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.04%. Comparing base (ef31e09) to head (ef3722b).
Report is 623 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2662       +/-   ##
===========================================
+ Coverage   35.91%   46.04%   +10.13%     
===========================================
  Files          69       81       +12     
  Lines       11576    13020     +1444     
===========================================
+ Hits         4157     5995     +1838     
+ Misses       7104     6680      -424     
- Partials      315      345       +30     

see 78 files with indirect coverage changes

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