fix(jest): add --forceExit jest call
fix(jest): add --forceExit jest call

Adding --forceExit and --detectOpenHandles flags to our jest call. This
should resolve issues we are seeing where jest fails to close after all
tests have been run.

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui