Don't load datepicker module until it is actually needed

[krzksz]

Description (*)

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

Goal here is to eliminate unnecessary loading of datepicker UI component, which is only needed when the shop has date of birth field enabled.

Performance improvement

Tested on Magento 2.4-develop with Luma and sample data.

• 205 → 202 JS requests (-1.46%).
• 698.40kB → 652.57kB JS transferred (-6.56%).

Manual testing scenarios (*)

1. Enable date of birth field for customers in admin.
2. Verify that jquery/ui-modules/datepicker.js is not loaded on pages that do not use datepicker (e.g. homepage, category, product etc.).
3. Verify that above file is loaded and datepicker works properly on pages that use it (e.g. customer registration form page).

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] Don't load datepicker module until it is actually needed #28823: Don't load datepicker module until it is actually needed

[m2-assistant]

Hi @krzksz. Thank you for your contribution
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[ihor-sviziev]

Hi @krzksz,
Please review failing tests, looks like date format has changed

[ihor-sviziev]

Hi @krzksz,
Functional tests still fails due to incorrect date format, please fix it

[krzksz]

@magento give me test instance

[magento-engcom-team]

Hi @krzksz. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @krzksz, here is your new Magento instance.
Admin access: https://pr-27860.instances.magento-community.engineering/admin_be04
Login: de96da0c Password: f341cfebc4ef
Instance will be terminated in up to 3 hours.

[ihor-sviziev]

✅ approved
Failing functional tests for EE isn’t related to changes from this PR

[DrewML]

Fantastic work! Suggested one additional optimization, but looks great!

[engcom-Delta]

@magento create issue

[m2-assistant]

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