message: test: deflake coverage take two
  Making the known-slow many header test slightly less slow in the hopes of reducing timeouts.
  Risk Level: n/a
  Testing: n/a
  Docs Changes: n/a
  Release Notes: n/a
diff: @@ -1096,7 +1096,7 @@ void HttpIntegrationTest::testManyRequestHeaders(std::chrono::milliseconds time)
  // This test uses an Http::HeaderMapImpl instead of an Http::TestHeaderMapImpl to avoid
  // time-consuming asserts when using a large number of headers.
  max_request_headers_kb_ = 96;
  - max_request_headers_count_ = 20005;
  + max_request_headers_count_ = 10005;
  config_helper_.addConfigModifier(
  [&](envoy::extensions::filters::network::http_connection_manager::v3::HttpConnectionManager&
  @@ -1112,7 +1112,7 @@ void HttpIntegrationTest::testManyRequestHeaders(std::chrono::milliseconds time)
  {Http::Headers::get().Scheme, "http"},
  {Http::Headers::get().Host, "host"}});
  - for (int i = 0; i < 20000; i++) {
  + for (int i = 0; i < 10000; i++) {
  big_headers->addCopy(Http::LowerCaseString(std::to_string(i)), std::string(0, 'a'));
  }
  initialize();
  