Create local_storage files on the server

[phil-davis]

Description

Modify acceptance test steps that create files in "local_storage" to use the testing app to create the files.

Related Issue

Motivation and Context

There is acceptance test code that still creates files in the local filesystem and expects them to "appear" in the server file system. We do not want to assume this works any more.

How Has This Been Tested?

Local runs of affected acceptance tests e.g.:

./tests/acceptance/run.sh tests/acceptance/features/apiMain/checksums.feature:73

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 #32781 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #32781   +/-   ##
=========================================
  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]

Backport stable10 #32784