chore: change mkt_cancel refs to mkt-cancel

[wdoconnell]

Closes #6758

The user accounts e2e test is failing because changes were made to the structure of some of the pages on our website. The CMS appears not to support underscores so the mkt_cancel page was moved to mkt-cancel. A redirect was added from the URL including the underscore, but it still causes our e2e tests to fail because it expects the user in that test to end on a url including mkt_cancel, not mkt-cancel.

This changes the references in the user accounts test and the UI from mkt_cancel to mkt-cancel so that the user is directed to the new page instead of relying on the redirect.

Checklist

Authors and Reviewer(s), please verify the following:

• A PR description, regardless of the triviality of this change, that communicates the value of this PR
• Well-formatted conventional commit messages that provide context into the change
• Documentation updated or issue created (provide link to issue/PR)
• Signed CLA (if not already signed)
• Feature flagged, if applicable

[appletreeisyellow]

Make sense to me! Thank you for fixing the e2e tests❤️ I also verified that the redirect url ends with mkt-cancel now

[abshierjoel]

Thank you!! 🚀💃🥳