Fix newline handling in file, softlink, and ImportLink template functions

Use state-based routing instead of sentinel strings, so whitespace-trimming
syntax (e.g. `{{- file "name" -}}`) correctly creates all named files and
symlinks.

Fixes: #2118

Signed-off-by: Jonathon Anderson <janderson@ciq.com>
Co-authored-by: Christian Goll <cgoll@suse.com>
Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/overlay/funcmap.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"os"
 	"path"
-	"path/filepath"
 	"strings"
 
 	warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
@@ -118,19 +117,6 @@ func createIgnitionJson(node *node.Node) string {
 	return string(tmpYaml)
 }
 
-func importSoftlink(lnk string) string {
-	target, err := filepath.EvalSymlinks(lnk)
-	if err != nil {
-		return "abort"
-	}
-	wwlog.Debug("importing softlink pointing to: %s", target)
-	return softlink(target)
-}
-
-func softlink(target string) string {
-	return fmt.Sprintf("{{ /* softlink \"%s\" */ }}", target)
-}
-
 // UniqueField returns a filtered version of a multi-line input string. input is
 // expected to be a field-separated format with one record per line (terminated
 // by `\n`). Order of lines is preserved, with the first matching line taking