[tests-only] sharing related etag tests

[individual-it]

Description

test is the etag is propagated correctly for shared folders

Related Issue

part of owncloud/product#144

Motivation and Context

mainly to make test etag propagation in OCIS

How Has This Been Tested?

🤖

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:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #37972 into master will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #37972      +/-   ##
============================================
- Coverage     64.72%   64.70%   -0.02%     
  Complexity    19445    19445              
============================================
  Files          1286     1286              
  Lines         76036    76032       -4     
  Branches       1336     1336              
============================================
- Hits          49213    49196      -17     
- Misses        26429    26442      +13     
  Partials        394      394              

Flag	Coverage Δ	Complexity Δ
#javascript	54.06% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.87% <0.00%> (-0.03%)	19445.00 <0.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
apps/files_sharing/templates/authenticate.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
core/templates/installation.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
core/templates/login.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
lib/private/Repair/DropOldTables.php	100.00% <ø> (ø)	6.00 <0.00> (ø)
settings/templates/panels/personal/profile.php	60.00% <0.00%> (ø)	0.00 <0.00> (ø)
settings/templates/setpassword.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
settings/templates/users/part.createuser.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
lib/private/Repair.php	75.26% <0.00%> (-6.46%)	21.00% <0.00%> (ø%)
core/Command/Maintenance/Repair.php	79.31% <0.00%> (-6.04%)	29.00% <0.00%> (ø%)

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