Include plugin name in the error message by operations

[reasonerjt]

fixes #6512

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.

[kaovilai]

--- FAIL: TestBackupOperationsReconcile (0.00s)
    --- FAIL: TestBackupOperationsReconcile/WaitingForPluginOperations_backup_with_completed_failed_operations_is_FinalizingPartiallyFailed (0.00s)
panic: 
assert: mock: I don't know what to return because the method call was unexpected.
	Either do Mock.On("Name").Return(...) first, or remove the Name() call.
	This method was unexpected:
		Name()
		
	at: [/github.com/vmware-tanzu/velero/pkg/plugin/velero/mocks/backupitemaction/v2/BackupItemAction.go:119 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller.go:386 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller.go:346 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller.go:177 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller_test.go:298] [recovered]
	panic: 
assert: mock: I don't know what to return because the method call was unexpected.
	Either do Mock.On("Name").Return(...) first, or remove the Name() call.
	This method was unexpected:
		Name()
		
	at: [/github.com/vmware-tanzu/velero/pkg/plugin/velero/mocks/backupitemaction/v2/BackupItemAction.go:119 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller.go:386 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller.go:346 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller.go:177 /github.com/vmware-tanzu/velero/pkg/controller/backup_operations_controller_test.go:298]

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (9b5678f) 61.24% compared to head (ca57756) 61.20%.
Report is 19 commits behind head on main.

Files	Patch %	Lines
pkg/controller/backup_operations_controller.go	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7115      +/-   ##
==========================================
- Coverage   61.24%   61.20%   -0.04%     
==========================================
  Files         257      258       +1     
  Lines       27273    27362      +89     
==========================================
+ Hits        16702    16747      +45     
- Misses       9388     9430      +42     
- Partials     1183     1185       +2     

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