build(bazel): fixup custom eslint test rule after bump to rules_js 2

[gregmagolan]

This regressed in https://github.com/sourcegraph/sourcegraph/pull/63022 where the custom gather_files_from_js_providers function that was copied over from rules_js 1.x was including runfiles (which would have also included all sources & transitive source implicitly as well).

Resolves eslint failures seen in https://buildkite.com/sourcegraph/sourcegraph/builds/277072#018fe743-abac-44d8-911b-d5a7ed425413 and observed locally:

(07:19:15) INFO: From ESLint client/wildcard/wildcard_lib_eslint-output.txt:
  |  
  | Oops! Something went wrong! :(
  |  
  | ESLint: 8.57.0
  |  
  | ESLint couldn't find a configuration file. To set up a configuration file for this project, please run:
  |  
  | npm init @eslint/config
  |  
  | ESLint looked for configuration files in /tmp/bazel-working-directory/__main__/bazel-out/k8-fastbuild/bin/client/wildcard/src/components/Alert and its ancestors. If it found none, it then looked in your home directory.
  |  
  | If you think you already have a configuration file or if you need more help, please stop by the ESLint Discord server: https://eslint.org/chat

Test plan

CI (check test logs)

Changelog

[Strum355]

Seems to do the job ty! 🙏