[tests-only] test etag propagation when changes happen on public links

[individual-it]

Description

more tests for etag propagation, this time when the change is made in a public link, the etag should have changed for the sharer

Related Issue

owncloud/product#144

Motivation and Context

test etags specially 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 #37983 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #37983      +/-   ##
============================================
- Coverage     64.70%   64.70%   -0.01%     
  Complexity    19445    19445              
============================================
  Files          1286     1286              
  Lines         76032    76034       +2     
  Branches       1336     1336              
============================================
  Hits          49196    49196              
- Misses        26442    26444       +2     
  Partials        394      394              

Flag	Coverage Δ	Complexity Δ
#javascript	54.06% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.87% <ø> (-0.01%)	19445.00 <ø> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
core/ajax/update.php	0.00% <0.00%> (ø)	11.00% <0.00%> (ø%)
core/Command/Upgrade.php	0.00% <0.00%> (ø)	29.00% <0.00%> (ø%)
lib/private/Server.php	85.41% <0.00%> (+0.22%)	129.00% <0.00%> (ø%)

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