feat: Impersonate a user (backport #25050)

[mergify]

This is an automatic backport of pull request #25050 done by Mergify.
Cherry-pick of ecc9ff3 has failed:

On branch mergify/bp/version-14-hotfix/pr-25050
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Changes to be committed:
	modified:   frappe/core/doctype/user/test_user.py
	modified:   frappe/core/doctype/user/user.js

Unmerged paths:
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	both modified:   frappe/core/doctype/user/user.py

Cherry-pick of c58ac80 has failed:

On branch mergify/bp/version-14-hotfix/pr-25050
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Changes to be committed:
	modified:   frappe/auth.py
	modified:   frappe/sessions.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/core/doctype/user/user.py

Cherry-pick of 0fd4d6b has failed:

On branch mergify/bp/version-14-hotfix/pr-25050
Your branch is ahead of 'origin/version-14-hotfix' by 2 commits.
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Unmerged paths:
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	both modified:   frappe/core/doctype/activity_log/activity_log.json
	both modified:   frappe/core/doctype/activity_log/activity_log.py
	both modified:   frappe/core/doctype/user/user.py

no changes added to commit (use "git add" and/or "git commit -a")

Cherry-pick of 24499d9 has failed:

On branch mergify/bp/version-14-hotfix/pr-25050
Your branch is ahead of 'origin/version-14-hotfix' by 4 commits.
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You are currently cherry-picking commit 24499d93f8.
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   frappe/core/doctype/user/user.js
	modified:   frappe/sessions.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/core/doctype/user/user.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

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[akhilnarang]

@Mergifyio rebase

[akhilnarang]

Tests are failing because some of the requests after the impersonated request seem to be using the same deleted user's SID, need to figure out why, its fine on v14/v15.