Check whether the action is a CSI action and whether CSI feature is

[blackpiglet]

enabled, before executing the action.

The DeleteItemAction is not checked, because the DIA doesn't have a method to get the action's plugin name.
This should be OK, because the CSI will check whether the VS and VSC have a backup name annotation. If the VS and VSC is not handled by the CSI plugin, then they don't have the annotation.

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Please add a summary of your change

Does your change fix a particular issue?

Fixes #6585

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]

Codecov Report

Merging #6968 (908e2c6) into main (5ff5073) will decrease coverage by 0.02%.
Report is 15 commits behind head on main.
The diff coverage is 13.33%.

@@            Coverage Diff             @@
##             main    #6968      +/-   ##
==========================================
- Coverage   61.03%   61.02%   -0.02%     
==========================================
  Files         251      252       +1     
  Lines       26837    26861      +24     
==========================================
+ Hits        16381    16392      +11     
- Misses       9303     9314      +11     
- Partials     1153     1155       +2     

Files	Coverage Δ
internal/delete/delete_item_action_handler.go	71.79% <ø> (ø)
pkg/util/csi/util.go	100.00% <100.00%> (ø)
pkg/backup/item_backupper.go	69.15% <0.00%> (-0.55%)	⬇️
pkg/restore/restore.go	65.77% <0.00%> (-0.16%)	⬇️
pkg/cmd/server/server.go	22.03% <0.00%> (-0.15%)	⬇️

... and 4 files with indirect coverage changes