Api webdav authAdd API acceptance tests for checking webdav operations with invalid auth

[dpakach]

Description

Api test for trying to access webdav endpoints with invalid authentication.

Related Issue

-owncloud/QA#632

Motivation and Context

How Has This Been Tested?

🤖

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

[codecov]

Codecov Report

Merging #36594 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #36594   +/-   ##
=========================================
  Coverage     64.67%   64.67%           
  Complexity    19057    19057           
=========================================
  Files          1268     1268           
  Lines         74504    74504           
  Branches       1311     1311           
=========================================
  Hits          48184    48184           
  Misses        25934    25934           
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54.02% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.84% <ø> (ø)	19057 <ø> (ø)	⬇️

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[phil-davis]

There was a yarn-install fail in drone https://drone.owncloud.com/owncloud/core/22012/36/7
I restarted.