test(WSTEAMA-1180): update topicPage tests to not use BFF

[karinathomasbbc]

Resolves JIRA [WSTEAMA-1180]

Overall changes

Refactor and stabilise tests for topic page.

Code changes

1. Removed cy.getPageData function and replaced it with getPageDataFromWindow
2. Used window.SIMORGH_DATA.pageData for canonical tests
3. Unskipped test
4. Added a BeforeEach() function, to ensure we always start from the path being tested and make the tests deterministic

Testing

• [x] Cypress Tests on PR passing

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

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