Use all years for admin search when no params

[TheDancingClown]

Signed-off-by: Louis Kirkham [email protected]

📝 A short description of the changes

Fixes year being switched to current year when admins enter search terms and submit.

• Changes selected year to "all_years" for admin search default
• params[:year] is being assigned twice due to the non-javascript year select. This PR select is removed so the param is only passed once.
• Changed :award_year param to :year

🔗 Link to the relevant story (or stories)

• https://app.asana.com/0/1200504523179343/1207921559820519/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