[net] Migrate away from old dynamic_annotations

Bug: 40209570
Cq-Include-Trybots: chromium/try:android-cronet-mainline-clang-arm64-dbg
Cq-Include-Trybots: chromium/try:android-cronet-mainline-clang-arm64-rel
Cq-Include-Trybots: chromium/try:android-cronet-mainline-clang-x86-dbg
Cq-Include-Trybots: chromium/try:android-cronet-mainline-clang-x86-rel
Cq-Include-Trybots: chromium/try:android-cronet-riscv64-dbg
Cq-Include-Trybots: chromium/try:android-cronet-riscv64-rel
Change-Id: I18affc67c2a3a5126027925536b9d6fac28dff6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5094013


Auto-Submit: Nathaniel Manista <nathaniel@google.com>
Commit-Queue: Nathaniel Manista <nathaniel@google.com>
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Stefano Duo <stefanoduo@google.com>
Cr-Commit-Position: refs/heads/main@{#1278977}