HDDS-11991. Use picocli built-in for missing subcommand of GenericCli

[adoroszlai]

What changes were proposed in this pull request?

• GenericCli does not need to implement Callable only for showing "incomplete command". The same functionality is provided by picocli.
  • Implement Callable in subclasses where missing. Implement Runnable where call() does not throw checked exceptions.
  • Remove MissingSubcommandException, no longer used.
• Remove explicit check for required parameter in GetUserInfoHandler, picocli does it for us.
  • Remove missingSubcommand method from GenericCli, no longer used.

https://issues.apache.org/jira/browse/HDDS-11991

How was this patch tested?

Tested GetUserInfoHandler without arguments:

$ ozone tenant user info
Missing required parameter: '<userPrincipal>'
Usage: ozone tenant user info [-hjV] [--om-service-id=<omServiceID>]
                              <userPrincipal>
Get tenant related information of a user
      <userPrincipal>   User name (principal)
  -h, --help            Show this help message and exit.
  -j, --json            Print result in JSON
      --om-service-id=<omServiceID>
                        Service ID is required when OM is running in HA cluster
  -V, --version         Print version information and exit.

Acceptance test covers GenericCli without subcommand (for top-level command ozone admin).

CI:
https://github.com/adoroszlai/ozone/actions/runs/12595048598

[nandakumar131]

@adoroszlai thanks for the improvement. Overall the change looks good to me, one minor comment.
Can we just use Callable in all places so that it will be consistent and uniform?

[adoroszlai]

Thanks @nandakumar131 for the review.

Can we just use Callable in all places so that it will be consistent and uniform?

Updated.

[nandakumar131]

Thanks @adoroszlai for the contribution!

[adoroszlai]

Thanks @nandakumar131 for reviewing and merging this.