feat(app-router): send X-Vinext-Router-Skip on navigation requests [4/6]#841

NathanDrake2406 wants to merge 4 commits intocloudflare:maincloudflare/vinext:mainfrom

NathanDrake2406:feat/pr-768-4-skip-header-transportNathanDrake2406/vinext:feat/pr-768-4-skip-header-transportCopy head branch name to clipboard