chore: export setupMessage function

[catsby]

Description

Export Zarf's root command message setup function:

zarf/src/cmd/root.go

Lines 211 to 220 in 36b779f

	type messageCfg struct {
	level string
	skipLogFile bool
	noColor bool
	// featureDisabled is a feature flag that disables it
	featureDisabled bool
	}
	// setupMessage configures message while we migrate over to logger.
	func setupMessage(cfg messageCfg) error {

UDS CLI uses Zarf as a library in parts and we'd like to be able to configure how Zarf does some outputting. In Zarf versions before v0.42.1, there was a common function to do so, but it's since been refactored and now unavailable to us.

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/cmd/root.go	0.00%	11 Missing ⚠️

Files with missing lines	Coverage Δ
src/cmd/root.go	0.00% <0.00%> (ø)