[stable10] Add per default the apps-external directory in config.php during installation

[mmattel]

Description

Backport of #30889

Related Issue

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

Motivation and Context

See the issue description regarding the benefits.

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)

[phil-davis]

https://drone.owncloud.com/owncloud/core/15692/169

./tests/drone/test-phpunit.sh: line 71: 29 Segmentation fault (core dumped)

I will restart drone

[codecov]

Codecov Report

Merging #34656 into stable10 will decrease coverage by 2.61%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##             stable10   #34656      +/-   ##
==============================================
- Coverage       66.61%      64%   -2.62%     
+ Complexity      19409    19247     -162     
==============================================
  Files            1162     1276     +114     
  Lines           64738    75801   +11063     
  Branches            0     1291    +1291     
==============================================
+ Hits            43127    48515    +5388     
- Misses          21611    26907    +5296     
- Partials            0      379     +379

Flag	Coverage Δ	Complexity Δ
#javascript	53.22% <ø> (?)	0 <ø> (?)
#phpunit	65.15% <0%> (-1.47%)	19247 <0> (-162)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Setup.php	25.66% <0%> (-0.95%)	53 <0> (+1)
lib/private/Files/Cache/HomePropagator.php	88.88% <0%> (-11.12%)	3% <0%> (ø)
apps/files/lib/Command/Scan.php	71.84% <0%> (-9.39%)	62% <0%> (ø)
lib/private/Files/Storage/DAV.php	81.09% <0%> (-7.78%)	0% <0%> (-161%)
lib/private/DB/AdapterOCI8.php	86.66% <0%> (-6.2%)	4% <0%> (ø)
lib/private/DB/OracleConnection.php	66.66% <0%> (-1.91%)	12% <0%> (ø)
...Builder/ExpressionBuilder/OCIExpressionBuilder.php	85.18% <0%> (-1.61%)	18% <0%> (ø)
apps/files_external/lib/Command/Backends.php	0% <0%> (ø)	0% <0%> (?)
core/js/config.js	3.33% <0%> (ø)	0% <0%> (?)
apps/files_external/lib/Lib/Backend/DAV.php	0% <0%> (ø)	0% <0%> (?)
... and 157 more

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[PVince81]

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