tools: remove dangling eslint symlink

The tools/eslint/node_modules/.bin/eslint symlink was unused by node,
but was present, and pointed at a non-existent file. This causes
problems for tooling.

Reviewed-By: Sam Roberts <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
PR-URL: #9299