Add debug logging for the artifact build output (#4208)

## Changes
Print the output of the artifact build scripts, if `--debug` is enabled

## Why
For debugging more complex build scripts it helpful to see the output.
Currently it is only printed when the scripts fails.

## Tests
- Ran `make test`
- Build the cli, ran it with a real life bundle with a complex build
script.

closes #4205

Author: mniehoff

NEXT_CHANGELOG.md

@@ -3,5 +3,6 @@
 ## Release v0.289.0
 
 ### Bundles
+* Log artifact build output in debug mode ([#4208](https://github.com/databricks/cli/pull/4208))
 
 ### Dependency updates

bundle/artifacts/build.go

@@ -101,6 +101,8 @@ func doBuild(ctx context.Context, artifactName string, a *config.Artifact) error
 		return fmt.Errorf("build failed %s, error: %v, output: %s", artifactName, err, out)
 	}
 
+	log.Debugf(ctx, "build output for %s:\n%s", artifactName, out)
+
 	return nil
 }