added/removed tags so that only @smoke_tests will run as part of the build-flow

I tagged these browser tests so they can be grouped and executed in Jenkins in the following manner:
- smoke_testing: will run as part of the build flow on code merge
- landing_page, loan_options: run as part of the nightly regression tests
- rate_checker, loan_comparison: will run when we deploy to build or can be run against demo while these modules are being developed