fix: Employee advance cancellation (backport #2297)

[mergify]

Issue:
Unable to cancel employee advance because of the payment reference in payment entry.
ref:22530

Employee.Advance.Cacellation.webm

Fix:

HR.Setting.to.Control.Payment.Unlink.webm

Backport needed: v15

---

This is an automatic backport of pull request #2297 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 3bbe0ce has failed:

On branch mergify/bp/version-15-hotfix/pr-2297
Your branch is ahead of 'origin/version-15-hotfix' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 3bbe0ceb2.
  (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/payroll/doctype/salary_slip/test_salary_slip.py
	modified:   hrms/payroll/doctype/salary_structure/test_salary_structure.py

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

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

[krantheman]

@l0gesh29 can you fix conflicts?

[ruthra-kumar]

@krantheman
Conflict addressed.

[frappe-pr-bot]

🎉 This PR is included in version 15.33.0 🎉

The release is available on GitHub release

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