Remove duplicate banner

[Mayisha]

Fixes #3561

When the legacy checkout is enabled, 2 different banners are displayed with a similar message.

Changes proposed in this Pull Request:

Showing 'LegacyExperienceTransitionNotice' only when the promotional banner is not about the same.

Testing instructions

• When the promotional surface is about re-auth, the yellow banner about enabling the new checkout experience should be displayed.

• When the promotional surface is about the new checkout experience, the yellow banner about enabling the new checkout experience should not be there.

[aheckler]

Does this affect only the Payment Methods tab, or both Payment Methods and Settings tabs?

[Mayisha]

Does this affect only the Payment Methods tab, or both Payment Methods and Settings tabs?

@aheckler only the payment methods tab.

[wjrosa]

Thanks for this fix, @Mayisha ! I am getting the following error when I enable the legacy checkout: It seems the error happens with promotional-banner-section.js

[Mayisha]

Hi @wjrosa 👋

I am getting the following error when I enable the legacy checkout:

I can not reproduce this issue. However, I was getting some other console errors/warnings which I fixed in e5a72d0. 👀