cli/command/context: remove deprecated k8s / orchestrator option-stubs

[thaJeztah]

relates to:

• Drop Kubernetes support (compose-on-kubernetes is now unmaintained & archived) #2967
• Drop support for (archived) Compose-on-Kubernetes #3139
• Deprecate Kubernetes stack support #3166
• Deprecate Kubernetes stack support #3167
• [20.10 backport] Deprecate Kubernetes stack support #3174

support for kubernetes contexts was deprecated in docker 20.10 through b639ea8, 0793f96, and 1d37fb3, and removed altoghether in 23.0 through 193ede9.

This patch removes the remaining stubs for options that were deprecated and no longer used.

- What I did

- How I did it

- How to verify it

- Description for the changelog

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

[codecov-commenter]

Codecov Report

Merging #4366 (41b12a4) into master (8181aa8) will increase coverage by 0.06%.
The diff coverage is 0.00%.

❗ Current head 41b12a4 differs from pull request most recent head 2133d04. Consider uploading reports for the commit 2133d04 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4366      +/-   ##
==========================================
+ Coverage   59.29%   59.35%   +0.06%     
==========================================
  Files         288      288              
  Lines       24770    24744      -26     
==========================================
  Hits        14688    14688              
+ Misses       9198     9172      -26     
  Partials      884      884              

[thaJeztah]

Flaky test: #4356

#19 95.87 === FAIL: cli/connhelper/commandconn TestCloseRunningCommand (5.00s)
#19 95.87     commandconn_unix_test.go:62: assertion failed: 5 (int) != 0 (n int)
#19 95.87     commandconn_unix_test.go:63: assertion failed: error is not nil: write |1: broken pipe
#19 95.87     commandconn_unix_test.go:74: test did not finish in time

[neersighted]

🔥