fix: Private images in PDFs from background jobs (backport #24980)

[mergify]

This is an automatic backport of pull request #24980 done by Mergify.
Cherry-pick of 718b5b8 has failed:

On branch mergify/bp/version-14-hotfix/pr-24980
Your branch is up to date with 'origin/version-14-hotfix'.

You are currently cherry-picking commit 718b5b8bee.
  (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:   frappe/core/doctype/file/test_file.py
	modified:   frappe/core/doctype/file/utils.py
	modified:   frappe/tests/test_pdf.py
	modified:   frappe/utils/response.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/utils/pdf.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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[mergify]

Cherry-pick of 718b5b8 has failed:

On branch mergify/bp/version-14-hotfix/pr-24980
Your branch is up to date with 'origin/version-14-hotfix'.

You are currently cherry-picking commit 718b5b8bee.
  (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:   frappe/core/doctype/file/test_file.py
	modified:   frappe/core/doctype/file/utils.py
	modified:   frappe/tests/test_pdf.py
	modified:   frappe/utils/response.py

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

[frappe-pr-bot]

🎉 This PR is included in version 14.67.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀