Fixup relative paths to work/localstorage

[phil-davis]

Description

Remove the assumption that the current working directory is tests/acceptance
That means using others ways to find out where the tests/acceptance/data and tests/acceptance/work folders can be found for various file upload/download test steps.

Related Issue

owncloud/QA#582

Motivation and Context

Currently the acceptance tests run.sh script must be run by first cd tests/acceptance then ./run.sh
It would be more convenient if we can run it from wherever, e.g. ./tests/acceptance/run.sh

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)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[codecov]

Codecov Report

Merging #32775 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #32775   +/-   ##
=========================================
  Coverage     64.14%   64.14%           
  Complexity    18681    18681           
=========================================
  Files          1177     1177           
  Lines         70284    70284           
  Branches       1270     1270           
=========================================
  Hits          45085    45085           
  Misses        24829    24829           
  Partials        370      370

Flag	Coverage Δ	Complexity Δ
#javascript	52.89% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.42% <ø> (ø)	18681 <ø> (ø)	⬇️

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[phil-davis]

This is a step towards adding make file targets for running acceptance tests.

[phil-davis]

Backport stable10 #32780