Data mover backup expose

[Lyndon-Li]

Add the code for data mover backup expose

[codecov-commenter]

Codecov Report

Merging #6308 (dd1eb3a) into main (25fb08b) will increase coverage by 0.43%.
The diff coverage is 69.51%.

@@            Coverage Diff             @@
##             main    #6308      +/-   ##
==========================================
+ Coverage   40.97%   41.41%   +0.43%     
==========================================
  Files         255      259       +4     
  Lines       23805    24254     +449     
==========================================
+ Hits         9754    10044     +290     
- Misses      13289    13445     +156     
- Partials      762      765       +3     

Impacted Files	Coverage Δ
pkg/util/kube/pod.go	0.00% <0.00%> (ø)
pkg/util/csi/volume_snapshot.go	47.00% <47.00%> (ø)
pkg/util/kube/pvc_pv.go	72.41% <72.41%> (ø)
pkg/exposer/csi_snapshot.go	79.48% <79.48%> (ø)

... and 9 files with indirect coverage changes