Bug/51376 - Add Primer::OpenProject::InputGroup captions

[akabiru]

What are you trying to accomplish?

https://community.openproject.org/wp/51376

Support first party captions on the Primer::OpenProject::InputGroup component- providing the caption via the text_input breaks the traling_action layout, hence the system argument is also denied.

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Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

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• Fixes axe scan violation - This change fixes an existing axe scan violation.
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• New axe violation - This change introduces a new axe scan violation. Please describe why the violation cannot be resolved below.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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[akabiru]

Stale- will re-open when working on it