Bug Report: `vtctldclient BackupShard` reads flags from `Backup` command instead

[ajm188]

Overview of the Issue

https://github.com/vitessio/vitess/blob/main/go/cmd/vtctldclient/command/backups.go#L139-L143

The three that read from backupOptions.Foo should instead read from backupShardOptions.Foo.

Reproduction Steps

$ vtctldclient BackupShard --allow-primary=true sharded/-80
ERROR: logging before flag.Parse: E0818 09:57:06.599116    1781 syslogger.go:149] can't connect to syslog
E0818 09:57:06.625180    1781 main.go:56] rpc error: code = Unknown desc = no tablet available for backup
$ vtctldclient Backup --allow-primary=true zone1-0000000200
$ echo $?
0

Binary Version

several

Operating System and Environment details

N/A

Log Fragments

No response