Add location context to synonyms upsell.

[thijsoo]

Context

• We missed one upsell link where want to add a context variable to the url.

Summary

This PR can be summarized in the following changelog entry:

• Fixes a not released bug where the context get parameter was not added to two upsell links.

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:

• Disable premium and build this RC/pr for free.

• Make sure every upsell link still works and ends up on: https://yoast.com/reasons-to-upgrade-keywords

• Open a post in the Gutenberg editor.

• In the metabox open the SEO analysis tab and click on the + Add synonyms button. In the modal make sure the Yoast SEO Premium link and the buy button both have a context parameter that is block-metabox.

• Do the same for the sidebar and make sure the context parameter is block-sidebar.

*Open a post in the classic editor.

• In the metabox open the SEO analysis tab and click on the + Add synonyms button. In the modal make sure the Yoast SEO Premium link and the but button both have a context parameter that is classic-metabox.

• Open a post in Elementor.

• In the sidebar open the SEO analysis tab and click on the + Add synonyms button. In the modal make sure the Yoast SEO Premium link and the but button both have a context parameter that is elementor-sidebar.

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 (Block/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.

Quality assurance

• I have tested this code to the best of my abilities
• 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.

Innovation

• No innovation project is applicable for this PR.
• This PR falls under an innovation project. I have attached the innovation label and noted the work hours.

Fixes #

[pls78]

CR && ACC: ✅