remove usage of downloadjs

[etanb]

This PR removes our usage of downloadjs which is a long-ago deprecated library that can be replicated by native JS functions.

Fixes #16309

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Manifest Files

frontend-react/package.json

• @types/downloadjs@^1.4.6
• downloadjs@^1.4.7

frontend-react/yarn.lock

• @types/downloadjs@1.4.6
• downloadjs@1.4.7

[github-actions]

Branch deployed to Chromatic 🚀.

• ⚠️ Detected 0 tests with visual changes.
• ✅ All tests passed.

View via:

• Chromatic: https://www.chromatic.com/build?appId=6419b81d4a47163c3050f14a&number=1221
• Storybook: https://6419b81d4a47163c3050f14a-kvubxxmhqt.chromatic.com/

[sonarqubecloud]

Quality Gate failed

Failed conditions
30.8% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[github-actions]

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[jpandersen87]

🎉