## What kind of change does this PR introduce?
Bug fix.
## What is the current behavior?
PR #44965 introduced an unused `cardExpiryLabel` constant in
`CreditCard.tsx`, which causes `studio#typecheck` to fail with `TS6133`
after the branch is merged into `master`.
## What is the new behavior?
Removes the unused constant so Studio typecheck passes again without
changing payment method behaviour.
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## Summary by CodeRabbit
* **Refactor**
* Removed unused code to improve code quality and maintainability.
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Danny White
aa674dd536