Bugfix FXIOS-11782 Missing experiment related image identifiers (backport #25733)

[mergify]

📜 Tickets

Jira ticket

💡 Description

After the experiment is disabled, the "x" button should now be StandardImageIdentifiers.Large.cross for iPhones. The change should've been in #25690 😄

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• 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)

---

This is an automatic backport of pull request #25733 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of a73eda1 has failed:

On branch mergify/bp/release/v137/pr-25733
Your branch is up to date with 'origin/release/v137'.

You are currently cherry-picking commit a73eda1ac.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   firefox-ios/firefox-ios-tests/Tests/XCUITests/TabCounterTests.swift

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   firefox-ios/firefox-ios-tests/Tests/XCUITests/TopTabsTest.swift

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mobiletest-ci-bot]

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Generated by 🚫 Danger Swift against fc5170f

[mergify]

This pull request has conflicts when rebasing. Could you fix it @mergify[bot]? 🙏

[github-actions]

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