feat(job_application): show job title in web form and prevent duplicate applications (backport #4964)

[mergify]

Closes: #4188, #4187

Summary

• Displays the job opening title (instead of raw ID) in the job application web form when navigating from a job listing
• Adds a Prevent Duplicate Applicant option on Job Opening to block the same email from applying to the same position more than once

validateDuplicateApplication.mov

In progress - Captcha verification in web form

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This is an automatic backport of pull request #4964 done by Mergify.

[mergify]

Cherry-pick of dfcc875 has failed:

On branch mergify/bp/version-16-hotfix/pr-4964
Your branch is up to date with 'origin/version-16-hotfix'.

You are currently cherry-picking commit dfcc875e9.
  (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:   hrms/hr/doctype/job_applicant/job_applicant.py
	modified:   hrms/hr/doctype/job_opening/job_opening.json
	modified:   hrms/hr/web_form/job_application/job_application.json

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   hrms/hr/doctype/job_opening/job_opening.py

Cherry-pick of 2b220b3 has failed:

On branch mergify/bp/version-16-hotfix/pr-4964
Your branch is ahead of 'origin/version-16-hotfix' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 2b220b3c3.
  (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:   hrms/hr/doctype/hr_settings/hr_settings.json
	modified:   hrms/hr/doctype/job_applicant/job_applicant.json
	modified:   hrms/hr/web_form/job_application/job_application.json

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   hrms/hr/doctype/hr_settings/hr_settings.py
	both modified:   hrms/hr/doctype/job_applicant/job_applicant.py

Cherry-pick of fd430b6 has failed:

On branch mergify/bp/version-16-hotfix/pr-4964
Your branch is ahead of 'origin/version-16-hotfix' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit fd430b654.
  (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:   hrms/hr/doctype/hr_settings/hr_settings.json
	modified:   hrms/hr/doctype/hr_settings/hr_settings.py
	modified:   hrms/hr/doctype/job_applicant/job_applicant.json
	modified:   hrms/hr/web_form/job_application/job_application.json

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   hrms/hr/doctype/job_applicant/job_applicant.py

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[mergify]

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