fix(upload): check if we need to create a folder before creating it

[susnux]

There are some cases when we need to create the folder:

• sub folders
• root folder if upload path was set (e.g. batchUpload('upload', ...)

So the HEAD request is more resilient.

Added tests for ensure we cover more of those cases.

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[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.15%. Comparing base (141ae5e) to head (2835d8a).

Files with missing lines	Patch %	Lines
lib/upload/uploader/UploadFileTree.ts	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main    #1687       +/-   ##
==========================================
+ Coverage   0.00%   85.15%   +85.15%     
==========================================
  Files         41       44        +3     
  Lines       1014     1098       +84     
  Branches     245      274       +29     
==========================================
+ Hits           0      935      +935     
+ Misses      1014      127      -887     
- Partials       0       36       +36     

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