fix(pwa): approval actions button for self leaves (backport #4395)

[mergify]

Reason

• On PWA, even if the check Prevent self approval for leaves even if user has permissions is enabled in HR Settings, they can see actions button to approve or reject. There is already a backend validation which doesn't allow user to approve their own leaves but these actions button should also be not visible to them

Changes done

• added conditions in hasPermssion for approval to prevent showing actions button for such case
• moved hr settings resource into a new resource file

Screen.Recording.2026-04-16.at.6.26.48.PM.mov

Summary by CodeRabbit

• New Features
  • Added new HR setting to control leave request self-approval. When enabled, this setting prevents employees from approving their own leave requests, ensuring proper separation of duties and enhanced oversight in the leave approval process. This provides organizations with greater control over leave approval workflows and compliance with separation of duties principles.

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This is an automatic backport of pull request #4395 done by [Mergify](https://mergify.com).