Travis running cypress (gitcoinco#9411)

* updating dependencies to use custom fork of cypress-metamask

* add script and options for running cypress tests

* add wait-on package for scripting cypress runs

* travis docs indicate that bionic will start xvfb by adding it as a service

* add migration step

* another attempt at including cypress tests

* redirect webserver logs to /dev/null

* bad idea to move stdout to dev/null

* add NETWORK_NAME to travis env file

* update runserver command to go to background

* updating existing cypress tests to run on ci

* update docker-compose file: use default accounts for ganache

* add set -x to get more visibility into cypress command args

* update call to cypress run to see if travis will recognize flags

* try running cypress directly from node_modules

* remove set -x now that arguments are making their way to cypress