[Tests-Only] Adjust usernames in UI tests

[phil-davis]

Description

Adjust the UI tests so that user0 is the primary actor.

Related Issue

Part of issue #33596

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

[phil-davis]

Note: this does not touch any API tests, so it should not effect ocis or ocis-reva testing.
But anyway, these PRs check that:

owncloud/ocis#280

owncloud/ocis-reva#205

[codecov]

Codecov Report

Merging #37395 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37395   +/-   ##
=========================================
  Coverage     64.57%   64.57%           
  Complexity    19222    19222           
=========================================
  Files          1268     1268           
  Lines         75107    75107           
  Branches       1331     1331           
=========================================
  Hits          48498    48498           
  Misses        26217    26217           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.73% <ø> (ø)	19222.00 <ø> (ø)

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