fix: TaxJar update - added nexus list, making api call only for nexus (backport #27497)

[mergify]

This is an automatic backport of pull request #27497 done by Mergify.
Cherry-pick of 54754f4 has failed:

On branch mergify/bp/version-13-hotfix/pr-27497
Your branch is ahead of 'origin/version-13-hotfix' by 7 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 54754f4eb8.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   erpnext/erpnext_integrations/doctype/taxjar_settings/taxjar_settings.py
	modified:   erpnext/regional/united_states/setup.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/patches/v13_0/custom_fields_for_taxjar_integration.py

Cherry-pick of 2d19e2d has failed:

On branch mergify/bp/version-13-hotfix/pr-27497
Your branch is ahead of 'origin/version-13-hotfix' by 18 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 2d19e2d54b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   erpnext/patches/v13_0/custom_fields_for_taxjar_integration.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/patches.txt

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[AfshanKhan]

@nemesis189 fix the conflicts