Remove DOMAIN envs

[batamar]

Is your enhancement request related to a problem? Please describe.
Configuring too many env variables is making the deployment process hard. So reducing all possible env variables.

Describe the solution you'd like
Getting backend domain from request cookies

Generated default values for WORKERS_API_DOMAIN, CRONS_API_DOMAIN, INTERATIONS_API_DOMAIN, ENGAGES_API_DOMAIN, LOGGER_DOMAIN based on MAIN_APP_DOMAIN like following

${MAIN_APP_DOMAIN}/integrations