fix(projects settings): add checkbox to auto fetch timesheet in sales invoice (backport #45908)

[mergify]

Issue:
Unable to link project without fetching the timesheet in the sales invoice.
ref: 31312

Before:

si-timesheet-issue.mp4

After:

si-timesheet-fix.mp4

Backport needed for v15

---

This is an automatic backport of pull request #45908 done by Mergify.

[mergify]

Cherry-pick of 876082e has failed:

On branch mergify/bp/version-15-hotfix/pr-45908
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 876082ea2f.
  (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:   erpnext/projects/doctype/projects_settings/projects_settings.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/projects/doctype/projects_settings/projects_settings.json

Cherry-pick of 914ad35 has failed:

On branch mergify/bp/version-15-hotfix/pr-45908
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 914ad357fd.
  (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:   erpnext/accounts/doctype/sales_invoice/sales_invoice.js

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/accounts/doctype/sales_invoice/sales_invoice.py

Cherry-pick of 5880f1d has failed:

On branch mergify/bp/version-15-hotfix/pr-45908
Your branch is ahead of 'origin/version-15-hotfix' by 3 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 5880f1d5c6.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/projects/doctype/timesheet/test_timesheet.py

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

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