fix: enforce json output for az monitor metrics and aks tools

[feiskyer]

This pull request introduces logic to ensure that all Azure CLI commands executed by our code default to JSON output unless an explicit output format is specified. This helps standardize command responses and makes downstream processing more predictable. The changes are implemented for both string-based and slice-based argument handling, with comprehensive unit tests added for each helper.

Output format enforcement:

• Added the ensureOutputFormatArgs helper to internal/components/azaks/executor.go to append --output json to command-line arguments when no output format is specified, using shlex for robust argument parsing. [1] [2] [3]
• Added the ensureOutputArg helper to internal/components/monitor/handlers.go for slice-based argument lists, ensuring --output json is present unless an output flag is already specified. [1] [2]

Testing:

• Added unit tests for ensureOutputFormatArgs in internal/components/azaks/executor_test.go to cover various scenarios, including malformed input.
• Added unit tests for ensureOutputArg in internal/components/monitor/handlers_test.go to verify correct behavior for different argument combinations.

[gossion]

LGTM