feat(paymnet): Remove isButtonMicroTextDisabled for not usage

[henrikh-kovalenko]

What/Why?

Removes the dead code related to the PI-2061.amazon_pay_button_micro_text_disabled experiment from checkout-sdk.

The experiment controlled whether the Amazon Pay button micro text ("USE YOUR AMAZON ACCOUNT") was hidden by passing design: 'C0001' to the Amazon Pay button config. This value was sourced from initializationData.isButtonMicroTextDisabled, which was set by bcapp based on a LaunchDarkly flag.

The experiment was disabled and fully removed from bcapp in bigcommerce/bigcommerce#67068, meaning isButtonMicroTextDisabled is no longer included in the initializationData response. This PR removes the now-dead handling code from checkout-sdk as a maintenance cleanup.

Rollout/Rollback

rollback this commit

Testing

without changes

without.changes.mov

with changes

with.changes.mov

---

Note

Low Risk
Dead-code removal only; default Amazon Pay button rendering is unchanged aside from no longer honoring a field that is no longer provided.

Overview
Removes checkout-sdk support for the retired PI-2061 Amazon Pay button micro-text experiment. initializationData.isButtonMicroTextDisabled is no longer read in cart/checkout strategies, and the processor no longer maps it to design: C0001 on Amazon Pay button config.

Also deletes AmazonPayV2ButtonDesign, related types/options, the micro-text unit test, and mock helpers—aligned with bcapp no longer sending this flag after LaunchDarkly cleanup.

^{Reviewed by Cursor Bugbot for commit 3bc82d8. Bugbot is set up for automated code reviews on this repo. Configure here.}

[PavlenkoM]

cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit dec07a2. Configure here.}

[bc-dmytro-herasymuk]

LGTM