[MFTF] Use StorefrontOpenCartPageActionGroup to go to Checkout page

[Usik2203]

Description (*)

This PR uses StorefrontOpenCartPageActionGroup to go to Checkout page and removes this part of code
<amOnPage url="{{CheckoutCartPage.url}}" stepKey="onPageShoppingCart"/>
<waitForPageLoad stepKey="waitForCartPageLoad"/>

[m2-assistant]

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[lbajsarowicz]

It's not hard requirements, but as I previously mentioned - could you change the naming to:
StorefrontCartPageOpenActionGroup ? This is because then you'll get hints on all the actions that can be performed on some specific area. For example: StorefrontCart| and then it shows all the actions one by another, not randomly mixed with StorefrontConfigurableProductAddToCartActionGroup :-)

[Usik2203]

Hi @lbajsarowicz .
Thank you for remarking. I will try to choose names more carefully.

[lbajsarowicz]

@Usik2203 I'm glad that you improve such annoying parts of MFTF.

[lbajsarowicz]

Thank you!

[magento-engcom-team]

Hi @lbajsarowicz, thank you for the review.
ENGCOM-7408 has been created to process this Pull Request
✳️ @lbajsarowicz, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

QA not applicable

[engcom-Echo]

@magento run Functional Tests EE, Functional Tests B2B

[m2-assistant]

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