[CAL-3751] [BUG] Add the 'cal-video' location only if it doesn't already exist



<sub>From [SyncLinear.com](https://synclinear.com) | [CAL-3751](https://linear.app/calcom/issue/CAL-3751/[bug]-add-the-cal-video-location-only-if-it-doesnt-already-exist)</sub>