[stable10] [PR 34898] Add the apps-external directory during setup only

[mmattel]

Description

Backport of PR #34898

Related Issue

• Fixes [Feature Request] make the apps-external folder default used in new installations #29839 (comment)

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[codecov]

Codecov Report

Merging #34902 into stable10 will decrease coverage by <.01%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##             stable10   #34902      +/-   ##
==============================================
- Coverage       64.23%   64.22%   -0.01%     
- Complexity      19901    19905       +4     
==============================================
  Files            1277     1277              
  Lines           76270    76277       +7     
  Branches         1292     1292              
==============================================
- Hits            48993    48991       -2     
- Misses          26898    26907       +9     
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.2% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.39% <0%> (-0.01%)	19905 <0> (+4)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Setup.php	24.89% <0%> (-0.78%)	57 <0> (+4)
apps/files_trashbin/lib/Expiration.php	96.55% <0%> (-1.73%)	29% <0%> (ø)
lib/private/Server.php	86.53% <0%> (-0.12%)	253% <0%> (ø)

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[PVince81]

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