Add eslint-no-duplicate-imports

[bbovenzi]

Turn on no-duplicate-imports eslint to remove multiple imports from the same place in a file, unless type is split from regular imports.

---

Was generative AI tooling used to co-author this PR?

• Yes Clause Sonnet 4.6

---

• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.