Do a cleanup of old features/edgeCases which are no longer valid/applicable

[ishan16696]

How to categorize this issue?

/kind enhancement

What would you like to be added

Do a cleanup of old code which were added to handle some backward compatibility of features/edgeCases which are no longer valid/applicable.

• [Enhancement] Drop support of passing credentials to etcd-backup-restore through a JSON file #741
• Handling of this failBelowRevision should now be removed from backup-restore, I don't remember when I used this last time.
  

  etcd-backup-restore/pkg/server/httpAPI.go

  Line 227 in 43a44d3

  failBelowRevisionStr := req.URL.Query().Get("failbelowrevision")

• Tests of Compact sub-command handling of v1 directory should also be removed.

Motivation (Why is this needed?)

To remove unnecessary handling of old cases and old features.

Acceptance Criteria

• Shouldn't break the current working of backup-restore.

Resources (optional)

• Contact
• Link

[ishan16696]

Please feel free to add more old features/edgeCases which are no longer valid/applicable.