Update the `@10up/cypress-wp-utils` package to 0.3.0

[dkotter]

Description of the Change

The v0.3.0 release of the @10up/cypress-wp-utils is now out so this PR upgrades to that and removes a couple custom commands we were using and instead uses the commands that are in that package.

How to test the Change

Ensure E2E tests pass on this PR

Changelog Entry

Changed - Update the @10up/cypress-wp-utils package to 0.3.0

Credits

Props @dkotter

Checklist:

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