* Add constants for C & C pages in our E2E tests
Inspired by WC E2E this will avoid going to admin to find out the links for these pages.
* Select C & C pages by using the main navigation links
* Fix function calls
* Revert back to using constants for C & C block pages' URLs
reverts 9587a0bd5efa5d97b484cd8d1bf927ff50f8e014 and bd7e2f996792d887756c0a0f4a10e6886574e77b
Raluca Stan