* don't use old hardcoded rule for validating imported posts * fix http verb in doc * Use client config * Handle local mode * E2E tests * Enforce default if unable to use real limit * Unit tests * Fix tests * Use model.PostMessageMaxRunesV2 as lower default * Update direct post message length validation --------- Co-authored-by: Mattermost Build <build@mattermost.com> Co-authored-by: streamer45 <cstcld91@gmail.com>