For #21478 fix flaky verifyOpenTopSiteNormalTab UI test

[AndiAJ]

For #21478 fix flaky verifyOpenTopSiteNormalTab UI test
✔️ Successfully passed 80x on Firebase

Results

matrix	result	logs	details
matrix-395yuwfm2dkb8	success	logs	1 test cases passed
matrix-46if4bt7owgta	success	logs	1 test cases passed
matrix-1tsk0232s8dyo	success	logs	1 test cases passed
matrix-1n4sutfgrvtjs	success	logs	1 test cases passed
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matrix-1jwqdcfv13ayf	success	logs	1 test cases passed
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matrix-2a3f14isvzpvf	success	logs	1 test cases passed
matrix-3h6kmowu49muq	success	logs	1 test cases passed
matrix-1977ey2cm8hku	success	logs	1 test cases passed

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features. In addition, it includes a screenshot of a successful accessibility scan to ensure no new defects are added to the product.

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