Refactor MTE-3853 Fix credit cards flacky tests

[mdotb-moz]

:scroll: Tickets

Jira ticket

:bulb: Description

We have some tests in CreditCard.swift file that are flacky. I introduced a set of tentative fixes for these tests that control the keyboard and wait for specific elements in the UI.

:pencil: Checklist

You have to check all boxes before merging

• [X] Filled in the above information (tickets numbers and description of your work)
• [X] Updated the PR name to follow our PR naming guidelines
• [ ] Wrote unit tests and/or ensured the tests suite is passing
• [ ] When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• [ ] If needed, I updated documentation / comments for complex code and public methods
• [ ] If needed, added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

	Messages
:book:	Edited 2 files
:book:	Created 0 files

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