[SG-34741] Search contexts management ARC checklist issues
Created by: gitstart-sourcegraph
Problem description
The following ARC toolkit issues exist in the search context management pages:
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Headers should not be H1, should be H2 styled as H1, on all pages (list page, view page, and add/edit page) 
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On list page, <ul>should use<li>instead of<div>for children
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On list page, "Filter search context" textbox should have an aria-label
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On edit page, Delete button doesn't meet color contrast requirements (should use a danger variant button instead)
Ref
Sourcegraph Issue GitStart Issue
Expected behavior
Should be fixed as described above
Test Plan
- Ensure integration test have accessibility audit and that those tests pass.
App preview:
Check out the client app preview documentation to learn more.