[PERF Improvements]Load polyfills for browsers that don't support certain features

[krzksz]

Description (*)

This PR is a part of my effort to improve Magento 2 frontend performance.

Here I'm using RequireJS configuration and the whole deps mechanism to conditionally load browser features polyfils only when needed. Changes in this PR include:

Manual testing scenarios (*)

1. UI components, e.g. in checkout or admin are still functional.
2. Polyfills for Map, WeakMap, FormData and MutationObserver are loaded only for old browsers that do not support them.

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)

Resolved issues:

1. resolves [Issue] [PERF Improvements]Load polyfills for browsers that don't support certain features #28382: [PERF Improvements]Load polyfills for browsers that don't support certain features

[m2-assistant]

Hi @krzksz. Thank you for your contribution
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[okorshenko]

memo: We do have a recording of this demo.

[ihor-sviziev]

@krzksz looks like it will be not easy to cover these changes with automatic tests. Do you think it's possible to cover your changes with some tests?

[ihor-sviziev]

As we discussed in Slack - it's too hard to cover these changes with automated tests, so I put label "not required"

[ihor-sviziev]

Hi @krzksz,
Your changes looks good to me.
Could you fix static tests?

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-7285 has been created to process this Pull Request

[magento-engcom-team]

Hi @engcom-Alfa. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @engcom-Alfa, here is your new Magento instance.
Admin access: https://pr-27618.instances.magento-community.engineering/admin_8eb0
Login: e84ff395 Password: 12428af099a7
Instance will be terminated in up to 3 hours.

[engcom-Alfa]

✔️ QA Passed

UI components are still functional and polyfills for Map, WeakMap, FormData, and MutationObserver aren't loaded for new browsers.

[VladimirZaets]

@magento create issue

[VladimirZaets]

@magento run all tests

[m2-assistant]

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