Add missing annotations to MFTF tests

[sta1r]

Description (*)

This PR addresses a number of DEPRECATION: notices raised when running MFTF tests.

The notices related to missing stories and severity annotations. I've tried wherever possible to follow the lead of sibling tests e.g. if a test has no severity annotation and all the other tests in its folder say <severity>CRITICAL</critical>, also mark as critical.

Questions or comments

It's worth noting that the devdocs:

• don't advise on differences in severity grade
• don't really clarify the distinction between (or hierarchy of) stories and features

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[lbajsarowicz]

Covered already in https://github.com/magento/magento2/pull/26391/files - I'd like to keep your PR to cover elements that are not covered by above mentioned PR.

[lbajsarowicz]

Waiting for https://github.com/magento/magento2/pull/26391/files to be merged, then resolve conficts.

[ihor-sviziev]

Hi @sta1r,
Could you please resolve conflicts?

[sta1r]

@ihor-sviziev conflicts resolved!

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-6975 has been created to process this Pull Request

[engcom-Alfa]

QA not applicable

[m2-assistant]

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