flake in UsesPreferredAddressDNAT

[alyssawilk]

[ RUN      ] QuicHttpIntegrationSPATests/QuicHttpIntegrationSPATest.UsesPreferredAddressDNAT/IPv4_quiche_client_impl
[2024-06-10 13:41:26.451][171728][critical][assert] [./source/common/singleton/threadsafe_singleton.h:56] assert failure: loader_ != nullptr. Details: InjectableSingleton used prior to initialization
[2024-06-10 13:41:26.451][171728][critical][backtrace] [./source/server/backtrace.h:127] Caught Aborted, suspect faulting address 0x3e90002683a
[2024-06-10 13:41:26.451][171728][critical][backtrace] [./source/server/backtrace.h:111] Backtrace (use tools/stack_decode.py to get line numbers):
[2024-06-10 13:41:26.451][171728][critical][backtrace] [./source/server/backtrace.h:112] Envoy version: 0/1.31.0-dev/test/RELEASE/BoringSSL
[2024-06-10 13:41:26.451][171728][critical][backtrace] [./source/server/backtrace.h:119] #0: __kernel_rt_sigreturn [0xe424d323f9d0]
[2024-06-10 13:41:26.451][171728][critical][backtrace] [./source/server/backtrace.h:119] #1: abort [0xe424d2fb4aac]
[2024-06-10 13:41:26.462][171728][critical][backtrace] [./source/server/backtrace.h:119] #2: Envoy::InjectableSingleton<>::get() [0xb2ed24]
[2024-06-10 13:41:26.473][171728][critical][backtrace] [./source/server/backtrace.h:119] #3: Envoy::Network::Address::Ipv4Instance::Ipv4Instance() [0x1a75e28]
[2024-06-10 13:41:26.485][171728][critical][backtrace] [./source/server/backtrace.h:119] #4: Envoy::Network::Address::InstanceFactory::createInstancePtr<>() [0x1a74b88]
[2024-06-10 13:41:26.496][171728][critical][backtrace] [./source/server/backtrace.h:119] #5: Envoy::Network::Address::addressFromSockAddr() [0x1a7427c]
[2024-06-10 13:41:26.507][171728][critical][backtrace] [./source/server/backtrace.h:119] #6: Envoy::Network::Address::addressFromSockAddrOrDie() [0x1a75038]
[2024-06-10 13:41:26.518][171728][critical][backtrace] [./source/server/backtrace.h:119] #7: Envoy::Network::IoSocketHandleImpl::recvmmsg() [0x1a50348]
[2024-06-10 13:41:26.529][171728][critical][backtrace] [./source/server/backtrace.h:119] #8: Envoy::Network::Utility::readFromSocket() [0x1a489e8]
[2024-06-10 13:41:26.540][171728][critical][backtrace] [./source/server/backtrace.h:119] #9: Envoy::Network::Utility::readPacketsFromSocket() [0x1a4a08c]
[2024-06-10 13:41:26.551][171728][critical][backtrace] [./source/server/backtrace.h:119] #10: Envoy::Network::UdpListenerImpl::handleReadCallback() [0x1488334]
[2024-06-10 13:41:26.563][171728][critical][backtrace] [./source/server/backtrace.h:119] #11: Envoy::Network::UdpListenerImpl::onSocketEvent() [0x14880d4]
[2024-06-10 13:41:26.574][171728][critical][backtrace] [./source/server/backtrace.h:119] #12: std::__1::__function::__func<>::operator()() [0x1489330]
[2024-06-10 13:41:26.585][171728][critical][backtrace] [./source/server/backtrace.h:119] #13: std::__1::__function::__func<>::operator()() [0x193b76c]
[2024-06-10 13:41:26.596][171728][critical][backtrace] [./source/server/backtrace.h:119] #14: Envoy::Event::FileEventImpl::mergeInjectedEventsAndRunCb() [0x193c918]
[2024-06-10 13:41:26.607][171728][critical][backtrace] [./source/server/backtrace.h:119] #15: event_process_active_single_queue [0x1d400ec]
[2024-06-10 13:41:26.618][171728][critical][backtrace] [./source/server/backtrace.h:119] #16: event_base_loop [0x1d3e98c]
[2024-06-10 13:41:26.629][171728][critical][backtrace] [./source/server/backtrace.h:119] #17: Envoy::Server::WorkerImpl::threadRoutine() [0xfb057c]
[2024-06-10 13:41:26.641][171728][critical][backtrace] [./source/server/backtrace.h:119] #18: Envoy::Thread::PosixThreadFactory::createPthread()::$_0::__invoke() [0x1d37200]

looks like this was touched fairly recently - greg could you take a look?