Remove bash completion for deprecated orchestrator flags

[albers]

• supersedes contrib/completion: remove "compose on kubernetes" flags zsh completion #3439
• closescontrib/completion: remove "compose on kubernetes" flags zsh completion #3439
• Follow up to Drop support for (archived) Compose-on-Kubernetes #3139
• Addresses Drop Kubernetes support (compose-on-kubernetes is now unmaintained & archived) #2967

See 039018b for corresponding docs change.

[codecov-commenter]

Codecov Report

Merging #3578 (6712447) into master (1497633) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #3578 +/- ##
=======================================
Coverage 59.36% 59.36% =======================================
Files 287 287 Lines 24175 24175 =======================================
Hits 14352 14352 Misses 8958 8958 Partials 865 865 

[thaJeztah]

❤️ Thanks!! I marked this PR as "replaces/closes" #3439, which I never got round to addressing your comments (😓); gave it a try, and looks to be working as expected 👍

[thaJeztah]

LGTM

[albers]

Thanks @thaJeztah.
I found the deprecated options when working on #3577 and I had completely forgotten #3439.

But my PR only covers bash completion, so maybe you could carry the zsh part of #3439?

[thaJeztah]

Ah, good one; yes, let me reopen that one, and only include the zsh commit