Refactor wwctl <node|profile> edit and fix bugs

`wwctl node edit` appears to not be working properly since MergeNode. This
refactor, partly towards #918, resolves the issues with `node edit` and updates
`profile edit` to match.

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/api/node/hash.go

@@ -1,20 +0,0 @@
-package apinode
-
-import (
-	"encoding/hex"
-
-	"github.com/warewulf/warewulf/internal/pkg/api/routes/wwapiv1"
-	"github.com/warewulf/warewulf/internal/pkg/node"
-	"github.com/warewulf/warewulf/internal/pkg/wwlog"
-)
-
-func Hash() *wwapiv1.NodeDBHash {
-	config, err := node.New()
-	if err != nil {
-		wwlog.Warn("couldb't read config")
-	}
-	hash := config.Hash()
-	return &wwapiv1.NodeDBHash{
-		Hash: hex.EncodeToString(hash[:]),
-	}
-}