Rename "Digital Subscription" to "Digital plus" subscription

[andresilva-guardian]

Current situation/background

The Digipack product is currently displayed to users as "Digital Subscription" throughout the manage-frontend application.

What does this PR change?

Renames user-facing references from "Digital Subscription" to "Digital Plus" for the Digipack product only. Backend identifiers (friendlyName, API field names) remain unchanged for API compatibility.

Files changed:

• productTypes.ts - Updated productTitle for digipack
• ConfirmDigiSubCancellation.tsx - Updated cancellation confirmation text
• VoucherCancellationFlowStart.tsx - Updated digital access benefit description
• AccountInformation.tsx - Updated subscription end date label

Note: "All-access digital" (Supporter Plus) references remain unchanged as they refer to a different product.

Next steps/further info

Test fixtures in baseProducts.ts still reference "Digital Subscription" in bundle names (e.g., "Sixday plus Digital Subscription") - these were intentionally left unchanged as they describe bundled products, not the standalone product name.

[Copilot]

Pull Request Overview

This PR renames the user-facing display name of the Digipack product from "Digital Subscription" to "Digital Plus" across the application while maintaining backend compatibility by keeping internal identifiers unchanged.

Key Changes:

• Updated the productTitle function in productTypes.ts to return "Digital Plus" instead of "Digital Subscription"
• Updated user-facing text in cancellation flows, voucher benefits, and account information displays
• Updated test expectations to match the new product name

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
shared/productTypes.ts	Changed the product title for digipack from "Digital Subscription" to "Digital Plus"
client/components/mma/cancel/cancellationSaves/digipack/ConfirmDigiSubCancellation.tsx	Updated cancellation confirmation message to use "Digital Plus subscription"
client/components/mma/cancel/voucher/VoucherCancellationFlowStart.tsx	Updated digital access benefit description to use "Digital Plus subscription"
client/components/helpCentre/diagnosticInformation/AccountInformation.tsx	Updated subscription end date label to "Digital Plus subscription end date"
cypress/tests/mocked/parallel-2/cancelPatron.cy.ts	Updated test assertion to expect "Digital Plus subscription" in cancellation flow
client/tests/components/payment/paymentUpdated.test.tsx	Updated test expectation to "Digital Plus Subscription"

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