fix(eslint): print relative paths in stylish output

[alexeagle]

Thanks @gregmagolan for walking me through the technique required.

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Changes are visible to end-users: no

Test plan

• Manual testing; please provide instructions so we can reproduce:

% ./lint.sh src:ts      
From bazel-out/darwin_arm64-fastbuild/bin/src/ts.AspectRulesLintESLint.out:

src/file.ts
  2:7  error  Type string trivially inferred from a string literal, remove type annotation  @typescript-eslint/no-inferrable-types
  7:1  error  Unnecessary try/catch wrapper                                                 no-useless-catch

✖ 2 problems (2 errors, 0 warnings)
  1 error and 0 warnings potentially fixable with the `--fix` option.

[gregmagolan]

🌮