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

[MeriemMechri]

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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[LilyL0u]

https://github.com/bbc/simorgh/pull/11554#discussion_r1580715329

I'm not sure about having it in a position where it runs for all the tests, as the pagination tests are a sequential user journey (e.g go to second page by clicking number 2, check page number, go to third page by clicking the next arrow, check page number. Next/Previous button tests won't have the same results if we go back to the same page before each test). For the page content tests this is fine, but not the pagination ones.