fix(core): route replay events in multiplexed transport#20408

logaretm wants to merge 2 commits intodevelopgetsentry/sentry-javascript:developfrom

awad/js-2199-session-replays-not-routing-to-dedicated-dsn-when-usinggetsentry/sentry-javascript:awad/js-2199-session-replays-not-routing-to-dedicated-dsn-when-usingCopy head branch name to clipboard