[accentance tests] wait for at least one file to appear in the list

[individual-it]

Description

wait for at least one item in the list, but do not fail if there is none, so that an empty list can be reported back

Related Issue

noticed when working on #2008 with saucelabs the timing was different and so some faivorites tests would fail

Motivation and Context

stabilise tests

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:

• ...