Cypress test refactor chartbeat tests

[karinathomasbbc]

Overall changes

Extract Chartbeat tests into function which can be shared across multiple tests

Code changes

• Create new helper function for chartbeat tests
• Replace all references to chartbeat tests with new function
• Remove helper command from cy, as this is now included in the new chartbeat test
• Chartbeat tests now run by default for all canonical pages

Testing

Environment	Smoke	Command	Status
local	true	CYPRESS_APP_ENV=local CYPRESS_SMOKE=true yarn test:e2e
local	false	CYPRESS_APP_ENV=local yarn test:e2e
test	true	CYPRESS_APP_ENV=test CYPRESS_SMOKE=true yarn cypress
test	false	CYPRESS_APP_ENV=test yarn cypress
live	true	CYPRESS_APP_ENV=live CYPRESS_SMOKE=true yarn cypress
live	false	CYPRESS_APP_ENV=live yarn cypress