Refactor assets enqueing hooks and callbacks

[enricobattocchi]

(cherry picked from commit dd80d2d)

Context

Summary

This PR can be summarized in the following changelog entry:

• Fixes a console notice in WordPress 6.7 about wrong enqueuing of assets in the iframed editor.

Relevant technical choices:

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

Relevant test scenarios

• Changes should be tested with the browser console open
• Changes should be tested on different posts/pages/taxonomies/custom post types/custom taxonomies
• Changes should be tested on different editors (Default Block/Gutenberg/Classic/Elementor/other)
• Changes should be tested on different browsers
• Changes should be tested on multisite

Test instructions for QA when the code is in the RC

• QA should use the same steps as above.

QA can test this PR by following these steps:

Impact check

This PR affects the following parts of the plugin, which may require extra testing:

UI changes

• This PR changes the UI in the plugin. I have added the 'UI change' label to this PR.

Other environments

• This PR also affects Shopify. I have added a changelog entry starting with [shopify-seo], added test instructions for Shopify and attached the Shopify label to this PR.

Documentation

• I have written documentation for this change. For example, comments in the Relevant technical choices, comments in the code, documentation on Confluence / shared Google Drive / Yoast developer portal, or other.

Quality assurance

• I have tested this code to the best of my abilities.
• During testing, I had activated all plugins that Yoast SEO provides integrations for.
• I have added unit tests to verify the code works as intended.
• If any part of the code is behind a feature flag, my test instructions also cover cases where the feature flag is switched off.
• I have written this PR in accordance with my team's definition of done.
• I have checked that the base branch is correctly set.

Innovation

• No innovation project is applicable for this PR.
• This PR falls under an innovation project. I have attached the innovation label.
• I have added my hours to the WBSO document.

Fixes https://github.com/Yoast/plugins-automated-testing/issues/1868

[coveralls]

Pull Request Test Coverage Report for Build 2ee56b565f92ded45e7dd80bdb9758da02f7ce38

Details

• 2 of 11 (18.18%) changed or added relevant lines in 1 file are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 54.677%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
admin/metabox/class-metabox.php	2	11	18.18%

Files with Coverage Reduction	New Missed Lines	%
admin/metabox/class-metabox.php	6	20.4%

Totals
Change from base Build 3b484c3d2b5ef01ce4e5a53c71a2e7b896f92b19:	-0.01%
Covered Lines:	29747
Relevant Lines:	54698

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💛 - Coveralls

[github-actions]

A merge conflict has been detected for the proposed code changes in this PR. Please resolve the conflict by either rebasing the PR or merging in changes from the base branch.