Bug fixes on award year filter for admin and assessor applications

[TheDancingClown]

📝 A short description of the changes

• Includes search params when setting the url on the radio buttons to persist search queries
• Sets the search query in the url even if not submitted - users are likely to use the filter by typing in a query and then switching the year.
• Bug fix on selected_year variable where it was being set to 'other' and causing label errors in the dropdown.
• Show text 'Deleted user' where a user in the 'Last Updated' column has been deleted - this was causing application crashes
• Accessibility fixes for focus and opening the dropdown menu when clicking on 'Other'
• General style fixes as per UI designs

🔗 Link to the relevant story (or stories)

• https://app.asana.com/0/1200504523179345/1207701977274875/f

Deployment implications

• None

✅ Checklist

• Features that cannot go live are behind a feature flag/env var or specify deploy date and open PR as draft
• I have checked that commit messages make sense and explain the reasoning for each change
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have squashed any unnecessary or part-finished commits

🖼️ Screenshots (if appropriate - no PII/Prod data):