Don't ignore dotfiles when running eslint

[ferrarimarco]

Fixes #3574

Proposed Changes

1. Don't ignore dotfiles when running eslint, but ignore anything in the node_modules directory.
2. Added a couple of test cases for the previous point.
3. Remove the .eslintignore file from our repository to centralize the ignored files configuration in .eslintrc.yml.
4. Remove .github/linters/.eslintrc.yml because we don't override any property vs the default (TEMPLATES/.eslintrc.yml), so we can use that one directly.

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[muiriswoulfe]

Thanks for getting this out!

[ferrarimarco]

@muiriswoulfe No worries :)

As you can see from the build logs, dotfiles are now picked up.