fix(payments-next): Update copy and Cancel action

[xlisachan]

Because

• Per legal feedback, we need to
  • add an After that sentence on our churn flows
  • cancel subscription instead of continue to cancel

This pull request

Issue that this pull request solves

Closes: PAY-3559

Checklist

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• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.

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