feat(External Contact): optimize form (LAN-802) (backport #257)

[mergify]

This is an automatic backport of pull request #257 done by Mergify.

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[mergify]

Cherry-pick of 331c34b has failed:

On branch mergify/bp/version-14-hotfix/pr-257
Your branch is ahead of 'origin/version-14-hotfix' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 331c34b4.
  (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:   landa/organization_management/doctype/external_contact/external_contact.js
	modified:   landa/organization_management/doctype/external_contact/external_contact.json
	modified:   landa/organization_management/doctype/external_contact/external_contact.py
	new file:   landa/patches/link_external_contact_to_regional_organization.py

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

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