Bump eslint-plugin-n from 16.6.2 to 17.24.0

### Bump eslint-plugin-n from 16.6.2 to 17.24.0 ([#6720](https://github.com/FlowFuse/flowfuse/pull/6720))

Major version bump (16 → 17). The branch is currently **blocked on merge conflicts** and has **6 failing CI checks**:

- Tests / Backend tests (20.x) (pull_request)
- Tests / Notify on failure (pull_request)
- Tests / Postgres tests (20.x) (pull_request)
- Tests / UI EE tests (pull_request)
- Tests / UI OS tests (pull_request)
- Tests / UI unit tests (pull_request)

**Note:** this clashes with another open ESLint-related PR — the version requirements are mutually exclusive. Decide which path wins before merging either, otherwise the second to land will need a rewrite. Resolve conflicts and triage the failing suites once the direction is settled.

Start by reviewing PR #6720 and the other open ESLint-related PR to determine which mutually exclusive version path should win. After the decision, resolve the merge conflicts and rerun the six listed CI checks; done means the chosen update is merged with those suites passing.

Written by the indexing model from the issue text.