Fix E2E Tests and Upgrade Cypress to version 13

[iamdharmesh]

Description of the Change

This PR fixes the E2E failure that occurred due to Block Editor now loading in an iframe by default in WP 6.3

PR upgrades the Cypress, Cypress utils lib, and @wordpress/env. Updates needed files as part of the upgrade.

• Bump Cypress version from 11.2.0 to 13.2.0
• Bump @10up/cypress-wp-utils version to 0.2.0
• Bump @wordpress/env version from 5.8.0 to 8.7.0

Also, PR upgrades minimum supported WP version from 5.7 to 5.8. (While investigating e2e failure on minimum, I found that code refactored in #56 drops supports of WP 5.7)

Closes #115
Closes #141

How to test the Change

Make sure PR PASS E2E tests check OR verify E2E tests locally.

Changelog Entry

Fixed - Ensure all E2E tests pass when running on WordPress 6.3
Changed - Bump minimum WordPress version from 5.7 to 5.8
Changed - Bump Cypress version from 11.2.0 to 13.2.0
Changed - Bump @10up/cypress-wp-utils version to 0.2.0
Changed - Bump @wordpress/env version from 5.8.0 to 8.7.0

Credits

Props @iamdharmesh @Sidsector9

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.