Allow the testing app to not be in the default apps folder

[phil-davis]

Description

Be smart about looking for the testing app skeleton directories within testing/data. Do not assume that they will be found under the apps folder.

Issue

#34194

Motivation and Context

See issue.

How Has This Been Tested?

Local acceptance test runs with the testing app installed in apps-external

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

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 #34193 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #34193      +/-   ##
============================================
+ Coverage     64.76%   64.76%   +<.01%     
  Complexity    18351    18351              
============================================
  Files          1198     1198              
  Lines         69467    69467              
  Branches       1281     1281              
============================================
+ Hits          44989    44993       +4     
+ Misses        24105    24101       -4     
  Partials        373      373

Flag	Coverage Δ	Complexity Δ
#javascript	53.09% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.12% <ø> (ø)	18351 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/View.php	84.6% <0%> (+0.3%)	398% <0%> (ø)	⬇️
lib/private/DB/Connection.php	66.17% <0%> (+0.73%)	49% <0%> (ø)	⬇️

---

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[codecov]

Codecov Report

Merging #34193 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #34193      +/-   ##
============================================
+ Coverage     64.76%   64.76%   +<.01%     
  Complexity    18351    18351              
============================================
  Files          1198     1198              
  Lines         69467    69467              
  Branches       1281     1281              
============================================
+ Hits          44989    44993       +4     
+ Misses        24105    24101       -4     
  Partials        373      373

Flag	Coverage Δ	Complexity Δ
#javascript	53.09% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.12% <ø> (ø)	18351 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/View.php	84.6% <0%> (+0.3%)	398% <0%> (ø)	⬇️
lib/private/DB/Connection.php	66.17% <0%> (+0.73%)	49% <0%> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3515439...3978dd4. Read the comment docs.

[phil-davis]

Backport stable10 #34196