Use PQueue to run only one create folder promise in folder upload

[LukasHirt]

Description

Use PQueue to run only one create folder promise in folder upload so that parent folder can be created before the children.

How Has This Been Tested?

• test environment: Manually

1. Upload folder with subfolder

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:

[DeepDiver1975]

In case the nested folder structure holds files with the same name there is a warning i the browser console.

[DeepDiver1975]

I did not properly see if this has an impact on the upload list - but given the warning and code location I suspect that the list will not properly be populated

@LukasHirt

[LukasHirt]

@DeepDiver1975 Added unique id and used it as a key. Error is gone now 😉