FMWK-556 Add folder validation before restore

[filkeith]

• check if directory is not empty

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.73684% with 24 lines in your changes missing coverage. Please review.

Project coverage is 80.25%. Comparing base (4affbb7) to head (79f9278).

Files with missing lines	Patch %	Lines
io/aws/s3/reader.go	51.72%	11 Missing and 3 partials ⚠️
io/gcp/storage/reader.go	80.76%	3 Missing and 2 partials ⚠️
io/local/reader.go	81.25%	2 Missing and 1 partial ⚠️
io/azure/blob/reader.go	91.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   80.22%   80.25%   +0.03%     
==========================================
  Files          93       93              
  Lines        5076     5167      +91     
==========================================
+ Hits         4072     4147      +75     
- Misses        706      715       +9     
- Partials      298      305       +7     

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