[Tests-Only] Skip meta username test on 10.4

[phil-davis]

Description

PR #37268 added code that prohibits certain special usernames. The acceptance test that was added will only work in 10.5 onwards. Skip it on older ownCloud versions.

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 #37349 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37349   +/-   ##
=========================================
  Coverage     64.55%   64.55%           
  Complexity    19217    19217           
=========================================
  Files          1268     1268           
  Lines         75100    75100           
  Branches       1331     1331           
=========================================
  Hits          48478    48478           
  Misses        26230    26230           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.70% <ø> (ø)	19217.00 <ø> (ø)

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