cleanup: Remove completion subcommand

With golangci#2105, completion subcommand will be automatically added. Consider
that golangci-lint didn't do anything special with completion, it's better
to ust remove it from codebase.

Signed-off-by: Tam Mach <[email protected]>

Author: sayboras

pkg/commands/completion.go

@@ -97,7 +97,6 @@ func NewExecutor(version, commit, date string) *Executor {
 	e.initHelp()
 	e.initLinters()
 	e.initConfig()
-	e.initCompletion()
 	e.initVersion()
 	e.initCache()