Add acceptance tests for checking that share with group and user with same name works

[dpakach]

Description

Add acceptance tests for checking that the shares with user and group with same name works.

Related Issue

• Checking bug in Cannot share with user and group having same name #35488

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

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]

Please also make some API test scenarios with the sharing API.
Add scenario(s) for when the group name has different case from the user-id. e.g. group User1 as well as group user
It will be good to also have tests that demonstrate how the API behaves.

[codecov]

Codecov Report

Merging #36283 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #36283   +/-   ##
=========================================
  Coverage        65%      65%           
  Complexity    19772    19772           
=========================================
  Files          1271     1271           
  Lines         74696    74696           
  Branches       1309     1309           
=========================================
  Hits          48554    48554           
  Misses        25756    25756           
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.21% <ø> (ø)	19772 <ø> (ø)	⬇️

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[phil-davis]

Tests look code - proves that this is a Sharing API bug.

[dpakach]

@ownclouders rebase