Pod Volume Backup/Restore Refactor: Remove Restic in code

[Lyndon-Li]

Remove irrational "Restic" names in Velero code after the PVBR refactor

[codecov-commenter]

Codecov Report

Merging #5444 (5f7f693) into main (b5b4db2) will decrease coverage by 0.01%.
The diff coverage is 45.94%.

@@            Coverage Diff             @@
##             main    #5444      +/-   ##
==========================================
- Coverage   40.62%   40.61%   -0.02%     
==========================================
  Files         236      236              
  Lines       20449    20458       +9     
==========================================
  Hits         8308     8308              
- Misses      11532    11541       +9     
  Partials      609      609              

Impacted Files	Coverage Δ
pkg/backup/pvc_snapshot_tracker.go	89.65% <ø> (ø)
pkg/buildinfo/buildinfo.go	100.00% <ø> (ø)
pkg/cmd/cli/backuplocation/delete.go	0.00% <0.00%> (ø)
pkg/cmd/server/server.go	6.84% <0.00%> (-0.11%)	⬇️
pkg/cmd/util/output/backup_repo_printer.go	0.00% <0.00%> (ø)
pkg/cmd/util/output/output.go	0.00% <0.00%> (ø)
pkg/podvolume/backupper.go	4.66% <0.00%> (ø)
pkg/podvolume/restorer.go	11.56% <ø> (ø)
pkg/repository/locker.go	0.00% <ø> (ø)
pkg/repository/manager.go	18.89% <ø> (ø)
... and 23 more

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