Test Helper to read file from server

[individual-it]

Description

easy way to read a file on the sever

needed for owncloud/firstrunwizard#105

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 #35151 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #35151      +/-   ##
============================================
+ Coverage     65.48%   65.49%   +<.01%     
  Complexity    18636    18636              
============================================
  Files          1217     1217              
  Lines         70536    70536              
  Branches       1296     1296              
============================================
+ Hits          46191    46195       +4     
+ Misses        23968    23964       -4     
  Partials        377      377

Flag	Coverage Δ	Complexity Δ
#javascript	53.5% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.87% <ø> (ø)	18636 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Server.php	86.68% <0%> (+0.11%)	253% <0%> (ø)	⬇️
lib/private/Files/Storage/DAV.php	81.09% <0%> (+0.63%)	0% <0%> (ø)	⬇️

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[dpakach]

Looks good 👍

[individual-it]

backport in #35158