use target_str_to_targets from tool-util package

needs: galaxyproject/galaxy#18522

planemo/conda.py

@@ -25,6 +25,7 @@
     CondaContext,
     CondaTarget,
 )
+from galaxy.tool_util.deps.mulled.mulled_build import target_str_to_targets
 from galaxy.util import unicodify
 
 from planemo.exit_codes import (
@@ -112,21 +113,6 @@ def collect_conda_targets(ctx, paths, recursive=False, found_tool_callback=None)
     return conda_targets
 
 
-# Copied and modified from mulled stuff - need to syncronize these concepts.
-def target_str_to_targets(targets_raw: str) -> List[CondaTarget]:
-    def parse_target(target_str: str) -> CondaTarget:
-        if "=" in target_str:
-            package_name, version = target_str.split("=", 1)
-        else:
-            package_name = target_str
-            version = None
-        target = CondaTarget(package_name, version)
-        return target
-
-    targets = [parse_target(_) for _ in targets_raw.split(",")]
-    return targets
-
-
 def collect_conda_target_lists(
     ctx: "PlanemoCliContext", paths: Iterable[str], recursive: bool = False, found_tool_callback=None
 ) -> List[FrozenSet[CondaTarget]]: