refactor(scripts): remove duplicate and orphaned script files

Remove 5 duplicate/orphaned scripts with redundant or unused functionality:
- test-affected.mjs (322 lines) - functionality in test.mjs
- lint-affected.mjs (419 lines) - 90% duplicate of lint.mjs
- test-ci.mjs (50 lines) - superseded by 'pnpm run test --all'
- test-wrapper.mjs (67 lines) - never used
- clean-test-cache.mjs - never called

Total: ~858 lines removed

Verification:
- No references in package.json scripts
- No references in GitHub workflows
- No references in other Socket repos (cli, lib, sdk, packageurl)
- All functionality preserved in main scripts
- All tests pass after removal

Author: jdalton