chore: improve the code refactored for backup

[ldming]

Fix comments left over from PR #4917

• Revert some incorrect changes
• Remove some unused code
• Use a shorter import name dpv1alpha1 to replace dataprotectionv1alpha1

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (1f87a87) 66.78% compared to head (c62228c) 66.83%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5306      +/-   ##
==========================================
+ Coverage   66.78%   66.83%   +0.04%     
==========================================
  Files         263      262       -1     
  Lines       29494    29490       -4     
==========================================
+ Hits        19699    19710      +11     
+ Misses       8254     8239      -15     
  Partials     1541     1541              

Flag	Coverage Δ
unittests	66.83% <54.54%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
controllers/apps/cluster_controller.go	90.26% <100.00%> (+0.08%)	⬆️
controllers/apps/transformer_backup_policy_tpl.go	76.24% <ø> (ø)
internal/controller/plan/restore.go	65.87% <100.00%> (ø)
controllers/apps/components/component.go	0.00% <0.00%> (ø)
controllers/dataprotection/actionset_controller.go	92.50% <0.00%> (ø)
internal/dataprotection/action/action_create_vs.go	46.85% <50.00%> (ø)
internal/dataprotection/action/action_job.go	77.27% <0.00%> (ø)
internal/dataprotection/backup/deleter.go	67.08% <50.00%> (ø)

... and 3 files with indirect coverage changes

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[ldming]

/approve to trigger test

[ldming]

/approve

[ldming]

/approve

[ldming]

/approve