[MFTF] Use Action Group to click on minicart

[Usik2203]

Description (*)

This PR changes <click selector="{{StorefrontMinicartSection.showCart}}" stepKey="clickCart"/> to
<actionGroup ref="StorefrontClickOnMiniCartActionGroup" stepKey="clickCart"/> to click on minicart

[m2-assistant]

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[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-7288 has been created to process this Pull Request

[engcom-Alfa]

QA not applicable

[m2-assistant]

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