[Issue] [Performance] Fix array merge in loop

[m2-assistant]

This issue is automatically created based on existing pull request: #30153: [Performance] Fix array merge in loop

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Summary (*)

Continuing #30002 - fix array merge in loop in different places.
Also this is follow up on my old PR #22248, so it should a bit improve static content deploy.

Examples (*)

Proposed solution

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)

[magento-engcom-team]

✅ Confirmed by @engcom-Alfa
Thank you for verifying the issue. Based on the provided information internal tickets MC-37917 were created

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