Fix CI minutes tests with new ChemLab updates

What does this MR do and why?

• Addresses #341753 (closed) - Use element_name? instead of has_element? based on new ChemLab update
• Addresses #342446 (closed)

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How to set up and validate locally

run

bundle exec bin/qa Test::Instance::All https://staging.gitlab.com -- qa/specs/features/ee/browser_ui/fulfillment/purchase/purchase_ci_spec.rb

MR acceptance checklist

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