Remove Reference of itemsnapshotter

[reasonerjt]

It will be removed as we choose to use BIAv2 for progress monitoring.

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov-commenter]

Codecov Report

Merging #5997 (98001aa) into main (5505110) will increase coverage by 0.65%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #5997      +/-   ##
==========================================
+ Coverage   40.35%   41.01%   +0.65%     
==========================================
  Files         252      248       -4     
  Lines       23213    22660     -553     
==========================================
- Hits         9368     9294      -74     
+ Misses      13133    12659     -474     
+ Partials      712      707       -5     

Impacted Files	Coverage Δ
pkg/backup/request.go	100.00% <ø> (ø)
pkg/controller/backup_controller.go	56.82% <0.00%> (+0.05%)	⬆️
pkg/plugin/clientmgmt/manager.go	88.94% <ø> (+8.85%)	⬆️
pkg/plugin/clientmgmt/process/client_builder.go	94.44% <ø> (-0.16%)	⬇️
pkg/plugin/framework/action_resolver.go	5.75% <ø> (+0.75%)	⬆️
pkg/plugin/framework/common/plugin_kinds.go	0.00% <ø> (ø)
pkg/plugin/framework/server.go	0.00% <ø> (ø)
pkg/backup/backup.go	52.14% <100.00%> (+0.13%)	⬆️
pkg/controller/restore_controller.go	67.48% <100.00%> (+0.17%)	⬆️
pkg/restore/restore.go	64.30% <100.00%> (+0.58%)	⬆️

... and 1 file with indirect coverage changes

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