ci: disable the lint job since it's currently not doing anything

the tslint rules have not been executed on the right files when this the lint was reenabled
after package splitup making the linting useless. When reenabled lots of errors show up.
I'm disabling this for now until we come back and fix up the code issues.

.travis.yml

@@ -40,7 +40,8 @@ env:
   matrix:
     # Order: a slower build first, so that we don't occupy an idle travis worker waiting for others to complete.
    - CI_MODE=js
-   - CI_MODE=lint
+   # disabled because it currently doesn't do anything
+   #- CI_MODE=lint
    - CI_MODE=e2e
    - CI_MODE=saucelabs_required
    - CI_MODE=browserstack_required