feat: toggle self leave approval for employees from HR settings (backport #2486)

[mergify]

Issue

Immediately after employees create and save leave application they see the document with "submit" as primary action that can lead to confusion as to clicking submit is part of the leave application process. So the employees ended up submitting their own leaves even if a different leave approver was already set in the application.
Role permission do not help in case one employee is leave approver for another employee.

---

Before

self_leave_approval_before.mov

After

self_leave_approval_pwa_after.mov

Screen.Recording.2025-01-30.at.2.46.24.PM.mov

Fix

Added a new setting in HR Settings called Prevent self-approval for leaves even if user has permissions which is disabled by default to retain current behaviour.
The submit action is removed on leave application if the settings is checked. Setting is ignored if the leave application doctype has a workflow.
Added tests for when self approval is enabled/disabled
I'll update the documentation once this is merged, no-docs for now

---

This is an automatic backport of pull request #2486 done by Mergify.

[mergify]

Cherry-pick of c74d2bb has failed:

On branch mergify/bp/version-14-hotfix/pr-2486
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Unmerged paths:
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	both modified:   hrms/hr/doctype/hr_settings/hr_settings.json

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Cherry-pick of 4acf169 has failed:

On branch mergify/bp/version-14-hotfix/pr-2486
Your branch is ahead of 'origin/version-14-hotfix' by 1 commit.
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Unmerged paths:
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	both modified:   hrms/hr/doctype/leave_application/leave_application.js
	both modified:   hrms/hr/doctype/leave_application/leave_application.py

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Cherry-pick of 52b5e1f has failed:

On branch mergify/bp/version-14-hotfix/pr-2486
Your branch is ahead of 'origin/version-14-hotfix' by 8 commits.
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You are currently cherry-picking commit 52b5e1f9.
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Changes to be committed:
	modified:   hrms/hr/doctype/leave_application/leave_application.py
	modified:   hrms/hr/doctype/leave_application/test_leave_application.py

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

Cherry-pick of e49c5a7 has failed:

On branch mergify/bp/version-14-hotfix/pr-2486
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Unmerged paths:
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	both modified:   hrms/hr/doctype/hr_settings/hr_settings.json

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Cherry-pick of bb15010 has failed:

On branch mergify/bp/version-14-hotfix/pr-2486
Your branch is ahead of 'origin/version-14-hotfix' by 11 commits.
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You are currently cherry-picking commit bb15010d.
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Unmerged paths:
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	both modified:   hrms/hr/doctype/leave_application/leave_application.js

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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

[asmitahase]

Most new settings in HR aren't available in v14, skipping this one too.