Code Quality Fix: Invalid @var usage

[lbajsarowicz]

Description (*)

This Pull Request answers the need of consistent @var notation in all the Magento files.

The only valid format is: @var ["Type"] [element_name] [<description>] (https://docs.phpdoc.org/guide/references/phpdoc/tags/var.html) but Magento did not follow this format, which now needs to be fixed.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. No change to the actual codebase, no testing is necessary.
2. ...

Questions or comments

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)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @lbajsarowicz. Thank you for your contribution!
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[ct-prd-pr-scan]

The security team has been informed about this pull request due to the presence of risky security keywords. For security vulnerability reports, please visit Adobe's vulnerability disclosure program on HackerOne or email psirt@adobe.com.

[ct-prd-pr-scan]

The security team has been informed about this pull request due to the presence of risky security keywords. For security vulnerability reports, please visit Adobe's vulnerability disclosure program on HackerOne or email psirt@adobe.com.

[lbajsarowicz]

@magento run all tests

(I submitted clear issue when the class was not defined, new version skips such)

[ct-prd-pr-scan]

The security team has been informed about this pull request due to the presence of risky security keywords. For security vulnerability reports, please visit Adobe's vulnerability disclosure program on HackerOne or email psirt@adobe.com.

[lbajsarowicz]

@magento run all tests

I found a few more issues with the codebase, fixed.

[ihor-sviziev]

We discussed this with @lbajsarowicz in Slack. So far, merging 300+ files in one step is almost impossible, as it would require a huge amount of static test fixes and, certainly, cause conflicts with releases that would need to be fixed multiple times.
I don't think this realistically can be merged any time soon.
Instead, I suggest adding a static test that would fail if the @var is misused. Then, those failures could be fixed with smaller pieces