fix: youtube race condition when GTM loads

[viadanna]

refer to #33649

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[mariajgrimaldi]

Hi there @viadanna! We usually backport PR(s) after their corresponding master PR is merged. So we'll review this contribution against quince.master once that happens. Thanks!

[mariajgrimaldi]

Hi there @pomegranited! Let me know when you merge the masters' PR so we can merge this. Thank you folks!

[pomegranited]

Hi @mariajgrimaldi , #33649 is merged.

[mariajgrimaldi]

Hi @pomegranited! Thanks for the ping. You can go ahead and merge this fix if you're confident with it. Can you also let the BTR channel know so they're aware too?

Thank you!

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