Automatically open the Advanced Settings section when visiting llms.txt feature

[pls78]

Context

• The settings dedicated to the llms.txt file are in a sub-section of the Settings' Advanced section, which is collapsed by default. This means that if the user is directed to the llms.txt sub-section they cannot see in which section they are (provided they didn't previously open the Advanced section).

Summary

This PR can be summarized in the following changelog entry:

• Opens the Advanced Settings' section when clicking the Customize llms.txt file button.

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:

• Visit Yoast SEO -> Settings
  • Verify the Advanced section is collapsed
  • In Site features enablethellms.txt` feature
  • Click on Customize llms.txt file
  • Verify the Advanced section is now open

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.

Impact check

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

• N/A

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 #271

[coveralls]

Pull Request Test Coverage Report for Build cd845b29438f7cf97f83ffde4181091163389283

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.001%) to 53.317%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/js/src/settings/app.js	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
packages/js/src/settings/app.js	1	0.0%

Totals
Change from base Build e9cd8ddac39df5b8fdc1e723737eac1a95868140:	-0.001%
Covered Lines:	31717
Relevant Lines:	59922

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💛 - Coveralls

[thijsoo]

CR + ACC 👍