Add wait before each Cypress test to reduce flakiness

[ngunner15]

• Add a wait time before testing each page.
• Wait would be conditional on successfully fetching page headings or other static values.
• All other tests would resume after successfully fetching the static values of the page.
• This would ensure the page is completely loaded and visible before the start of Cypress tests and in turn, would reduce the flakiness of some tests.
• Testing on local env and GitHub env.