fix: validate username availability against API in Setup Wizard admin step#38991

amitkumarashutosh wants to merge 2 commits into

RocketChat:developRocketChat/Rocket.Chat:developfrom

amitkumarashutosh:fix/setup-wizard-check-username-availabilityamitkumarashutosh/Rocket.Chat:fix/setup-wizard-check-username-availabilityCopy head branch name to clipboard