remove alternateUpdatePaymentMethodNavigation flag and updated tests

[joyceqin-stripe]

Summary

Removed the alternateUpdatePaymentMethodNavigation flag that gated the new update payment method screen. Now, by default, any payment method that can be removed or edited (card, US bank account, SEPA debit) will display an edit icon or chevron (horizontal vs vertical) that will lead to the new UpdatePaymentMethod screen.

Motivation

Testing

Changelog

[Changed] Changed the edit and remove saved payment method flow so that tapping 'Edit' displays an icon that leads to a new update payment method screen

[github-actions]

🚨 New dead code detected in this PR:

String+Localized.swift:352 warning: Property 'remove_payment_method' is unused
CustomerSavedPaymentMethodsCollectionViewController.swift:43 warning: Enum case 'didSelectRemoveOnInvalidItem' is unused

Please remove the dead code before merging.

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[porter-stripe]

Have we fixed the bug called out here? https://stripe.slack.com/archives/C07RF1UM08M/p1733430979980769

[joyceqin-stripe]

Have we fixed the bug called out here? https://stripe.slack.com/archives/C07RF1UM08M/p1733430979980769

I believe so, yes

[porter-stripe]

We should add a CHANGELOG entry for this, cc @amk-stripe

[porter-stripe]

Since all cards are now editable, do we need " (viewModel?.savedPaymentMethod?.isCoBrandedCard ?? false && cbcEligible)"?

[joyceqin-stripe]

If payment method removal is not allowed, then you can only edit your payment methods if it's a cbc card (and in the future, if it allows set as default), right?

[porter-stripe]

Yep that sounds right.

[porter-stripe]

Nit:

• We're missing a new line under this
• Need a period to end the sentence (see other entries)
• We should explain what this new payment method screen does e.g. displays card cvc, expiry, bank acct details, sepa, etc.