[FEAT cloudctl] - Refactor output.Printer #84

Priority

(Medium) I'm annoyed but I'll live

User Story

At the moment each subcommand is implemented in 2 parts: main functionality in subcommand definition file, output functionality defined as a switch case of plain/interactive output.Printer. Each subcommand is calculating the printer on its own using the same copy-pasted code what can be done once on rootcmd initialization.

Description

This issue is about introducing new output.Printer interface, which will contain AsJSON, AsYAML, AsPlainText, AsInteractive methods. Each subcommand which is outputting any data should implement this interface.

Part for selecting the output printer and calling it (which are now copy-pasted on each subcommand core functions) also should be moved to common place (init of root cmd?) which should set a variable available to be consumed by subcommand code (e.g. allowing to check for interaction, control spinner).

Mentioned variable and output handling code should land in ./internal/ package

Acceptance Criteria

• new printer interface introduced in internal/ package
• code for selecting printer added to root command initialization
• subcommands refactored to use new interface:
  • bootstrap
  • cluster-version
  • sync
  • update
  • version
• old cmd/output/ package removed

Reference Issues

No response