Fix product gallery jump during page load

[ihor-sviziev]

Description (*)

• Position absolute will prevent page jumping
• Move logic from JS to css (position absolute + z-index=-1 will render gallery on background)

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes Product gallery jumps while loading #32315

Manual testing scenarios (*)

1. ...
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)
• All automated tests passed successfully (all builds are green)

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[ihor-sviziev]

@magento run all tests

[ihor-sviziev]

@magento run Functional Tests B2B, Functional Tests CE, Functional Tests EE, Static Tests

[ihor-sviziev]

@magento run Functional Tests B2B, Functional Tests CE, Functional Tests EE, Static Tests

[ihor-sviziev]

@magento run Database Compare, Integration Tests, Magento Health Index, Sample Data Tests B2B, Sample Data Tests CE , Sample Data Tests EE, Semantic Version Checker, Unit Tests, WebAPI Tests

[ihor-sviziev]

@magento run Functional Tests B2B, Functional Tests CE, Functional Tests EE

[Den4ik]

@ihor-sviziev Thanks for your work.
Reproduced described steps in issue and fix locally. All looks good.

[ihor-sviziev]

These changes were already merged in another pull request #33265 (comment)