auto detect current deploytype when running commands

[davidgamero]

instead of requiring user input to select deployType every time, deployType correlates 1:1 with the presence of templated folders

./charts -> helm
./base && ./overlays -> kustomize
./manifests -> manifests

at minimum, when calling generate-workflow, draft could detect if only one of these is present, and default to it instead of prompting for selection every time

additionally, abstracting the ability to update images in a deployType-agnositc interface would greatly simplify the code

draft/pkg/workflows/workflows.go

Line 37 in 0402605

func updateProductionDeployments(deployType, dest string, flagValuesMap map[string]string, templateWriter templatewriter.TemplateWriter) error {