Chore: Set root flag in eslint

[Pezmc]

Description

Currently when using flowforge-dev-env, eslint will work it's way up the file tree and import all eslint files it finds. This leads to inconsistent linting depending whether the repo is checked out directly or via the dev env.

Setting the root flag tells ESLint not to propagate up the tree.

Related Issue(s)

None

Checklist

• [ ] I have read the contribution guidelines
• [ ] Suitable unit/system level tests have been added and they pass
• [ ] Documentation has been updated
  • [ ] Upgrade instructions
  • [ ] Configuration details
  • [ ] Concepts
• [ ] Changes flowforge.yml?
  • [ ] Issue/PR raised on flowforge/helm to update ConfigMap Template
  • [ ] Issue/PR raised on flowforge/CloudProject to update values for Staging/Production

Labels

• [ ] Backport needed? -> add the backport label
• [ ] Includes a DB migration? -> add the area:migration label