remove undocumented top-level "docker remove" command

[thaJeztah]

• replaces / closes #6142 fixed aliases for docker rm --help #6143
• closes missing alias for remove command #6142
• relates to / introduced in rm: allow docker container remove as an alias #3986
• relates to docker container remove and docker container copy do not exist, while docker (image|volume|network) remove exist #3985

This was introduced in 9b54d86, which added docker container remove as alias for docker container rm.

However, due to the NewRmCommand being used both for adding the top-level docker rm command and for adding the docker container rm command, it also introduced a (hidden) top-level docker remove command;

docker remove --help | head -n1
Usage:  docker rm [OPTIONS] CONTAINER [CONTAINER...]

The command was not documented, and did not appear in --help output, nor was auto-complete provided;

docker --help | grep remove

docker r<TAB>
rename               (Rename a container)  rm  (Remove one or more containers)  run  (Create and run a new container from an image)
restart  (Restart one or more containers)  rmi     (Remove one or more images)

This patch adds a dedicated, non-exported newRemoveCommand to add sub- commands for docker container, taking a similar approach as was done in moby@b993609d5a for docker image rm.

With this patch applied, the hidden command is no longer there, but the docker rm, docker container rm, and docker container remove commands stay functional as intended;

docker remove foo
docker: unknown command: docker remove

Run 'docker --help' for more information

docker rm --help | head -n1
Usage:  docker rm [OPTIONS] CONTAINER [CONTAINER...]
docker container rm --help | head -n1
Usage:  docker container rm [OPTIONS] CONTAINER [CONTAINER...]
docker container remove --help | head -n1
Usage:  docker container rm [OPTIONS] CONTAINER [CONTAINER...]

Reported-by: Lorenzo Buero 138243046+LorenzoBuero@users.noreply.github.com

- What I did

- How I did it

- How to verify it

- Human readable description for the release notes

Remove an undocumented, hidden, top-level `docker remove` command that was accidentally introduced in docker 23.0

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 55.08%. Comparing base (747cb44) to head (19a5c5c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6144      +/-   ##
==========================================
- Coverage   55.09%   55.08%   -0.01%     
==========================================
  Files         362      362              
  Lines       30265    30268       +3     
==========================================
- Hits        16675    16674       -1     
- Misses      12628    12632       +4     
  Partials      962      962              

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