Add confirm flag to velero plugin add

[kaovilai]

Signed-off-by: Tiger Kaovilai tkaovila@redhat.com

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Please add a summary of your change

Add confirm flag to velero plugin add

~/git/velero biaOperationErrorsPluginName* 15s
❯ go run ./cmd/velero plugin add testImage --confirm
An error occurred: Unauthorized
exit status 1

~/git/velero biaOperationErrorsPluginName* 7s
❯ go run ./cmd/velero plugin add testImage          
velero plugin add may cause the Velero server pod restart, so it is a dangerous operation
once Velero server restarts, all the ongoing jobs will fail.
Are you sure you want to continue (Y/N)? y
An error occurred: Unauthorized
exit status 1

~/git/velero biaOperationErrorsPluginName*
❯ go run ./cmd/velero plugin add testImage 
velero plugin add may cause the Velero server pod restart, so it is a dangerous operation
once Velero server restarts, all the ongoing jobs will fail.
Are you sure you want to continue (Y/N)? n

~/git/velero biaOperationErrorsPluginName*
❯ go run ./cmd/velero backup delete --all
Are you sure you want to continue (Y/N)? y
An error occurred: failed to get API group resources: unable to retrieve the complete list of server APIs: velero.io/v1: Unauthorized
exit status 1

~/git/velero biaOperationErrorsPluginName* 6s
❯ 

Does your change fix a particular issue?

Fixes #6542

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

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 61.71%. Comparing base (f1f7f04) to head (3c24365).

Files	Patch %	Lines
pkg/cmd/cli/delete_options.go	0.00%	2 Missing ⚠️
pkg/cmd/cli/backuplocation/delete.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7566      +/-   ##
==========================================
+ Coverage   61.70%   61.71%   +0.01%     
==========================================
  Files         263      263              
  Lines       28861    28843      -18     
==========================================
- Hits        17808    17800       -8     
+ Misses       9793     9782      -11     
- Partials     1260     1261       +1     

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