[Tests-Only] Skip tests that fail due to issue-files_primary_s3-387

[phil-davis]

Description

These new etag-propagation tests fail on S3 storage - see the issue.
Skip them on S3 storage.

Related Issue

owncloud/files_primary_s3#387

How Has This Been Tested?

CI

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 #37969 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37969   +/-   ##
=========================================
  Coverage     64.72%   64.72%           
  Complexity    19445    19445           
=========================================
  Files          1286     1286           
  Lines         76037    76037           
  Branches       1336     1336           
=========================================
  Hits          49213    49213           
  Misses        26430    26430           
  Partials        394      394           

Flag	Coverage Δ	Complexity Δ
#javascript	54.06% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.89% <ø> (ø)	19445.00 <ø> (ø)

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