Fix PVR issue for generic data path

[Lyndon-Li]

Fix a PVR issue for generic data path -- the namespace remap was not honored, and enhance the code for better error handling

[codecov-commenter]

Codecov Report

Merging #6303 (6c16020) into main (5cb7217) will decrease coverage by 0.02%.
The diff coverage is 6.66%.

@@            Coverage Diff             @@
##             main    #6303      +/-   ##
==========================================
- Coverage   40.98%   40.97%   -0.02%     
==========================================
  Files         255      255              
  Lines       23804    23830      +26     
==========================================
+ Hits         9756     9764       +8     
- Misses      13287    13304      +17     
- Partials      761      762       +1     

Impacted Files	Coverage Δ
pkg/controller/pod_volume_restore_controller.go	20.16% <0.00%> (ø)
pkg/uploader/kopia/snapshot.go	32.30% <0.00%> (-1.94%)	⬇️
pkg/uploader/types.go	100.00% <ø> (ø)
pkg/uploader/provider/kopia.go	55.24% <100.00%> (+0.31%)	⬆️

... and 1 file with indirect coverage changes