[services] Remove networks from services docker-compose file.

Summary:
This diff removes networks from the services docker-compose file to use the default shared network and omit complex network setup.

Linear task: ENG-774

Test Plan: Run yarn run-tunnelbroker-service-dev-mode and connect to the localstack and rabbitmq service by the hostnames localstack and rabbitmq respectively from inside of the tunnelbroker container.

Reviewers: karol-bisztyga, palys-swm, ashoat, varun

Reviewed By: palys-swm

Subscribers: varun, ashoat, palys-swm, Adrian, atul, karol-bisztyga, yayabosh

Differential Revision: https://phabricator.ashoat.com/D4149