[28.x backport] cli: deprecate VisitAll, DisableFlagsInUseLine utilities, remove HasCompletionArg #6276
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cli: remove HasCompletionArg utility
It was only used in a single place and has no external consumers.
Move it to where it's used to keep things together.
cli: deprecate VisitAll, DisableFlagsInUseLine utilities
These utilities were only used internally; create a local copy
where used, and deprecate the ones in cli.
cmd/docker: fix some minor linting issues
- Human readable description for the release notes
- A picture of a cute animal (not mandatory but encouraged)