Delegate defaulting series of local charms to deploy

This does not really belong in bundle client-side code, but should live
in the controller/deployment side of things

core/bundle/changes/changes_test.go

@@ -3668,30 +3668,6 @@ func (s *changesSuite) TestLocalCharmWithExplicitBase(c *gc.C) {
 	s.assertLocalBundleChangesWithDevices(c, charmDir, bundleContent, "ubuntu@16.04/stable")
 }
 
-func (s *changesSuite) TestLocalCharmWithSeriesFromCharm(c *gc.C) {
-	charmDir := filepath.Join(c.MkDir(), "multiseries")
-	err := os.Mkdir(charmDir, 0700)
-	c.Assert(err, jc.ErrorIsNil)
-	bundleContent := fmt.Sprintf(`
-        applications:
-            django:
-                charm: %s
-    `, charmDir)
-	charmMeta := `
-name: multi-series
-summary: That's a dummy charm with multi-series.
-description: A dummy charm.
-series:
-    - jammy
-    - focal
-    - bionic
-`[1:]
-	err = os.WriteFile(filepath.Join(charmDir, "metadata.yaml"), []byte(charmMeta), 0644)
-	c.Assert(err, jc.ErrorIsNil)
-	s.assertLocalBundleChanges(c, charmDir, bundleContent, "ubuntu@22.04/stable")
-	s.assertLocalBundleChangesWithDevices(c, charmDir, bundleContent, "ubuntu@22.04/stable")
-}
-
 func (s *changesSuite) TestLocalCharmWithBaseFromBundle(c *gc.C) {
 	charmDir := c.MkDir()
 	bundleContent := fmt.Sprintf(`

core/bundle/changes/handlers.go

@@ -14,7 +14,6 @@ import (
 	"github.com/juju/naturalsort"
 
 	corebase "github.com/juju/juju/core/base"
-	corecharm "github.com/juju/juju/core/charm"
 )
 
 type resolver struct {
@@ -1288,20 +1287,7 @@ func getSeries(application *charm.ApplicationSpec, defaultSeries string) (string
 
 	// Handle local charm paths.
 	if charm.IsValidLocalCharmOrBundlePath(application.Charm) {
-		_, charmURL, err := corecharm.NewCharmAtPath(application.Charm, defaultSeries)
-		if corecharm.IsMissingSeriesError(err) {
-			// local charm path is valid but the charm doesn't declare a default series.
-			return defaultSeries, nil
-		} else if corecharm.IsUnsupportedSeriesError(err) {
-			// The bundle's default series is not supported by the charm, but we'll
-			// use it anyway. This is no different to the case above where application.Series
-			// is used without checking for potential charm incompatibility.
-			return defaultSeries, nil
-		} else if err != nil {
-			return "", errors.Trace(err)
-		}
-		// Return the default series from the local charm.
-		return charmURL.Series, nil
+		return defaultSeries, nil
 	}
 
 	// The following is safe because the bundle data is assumed to be already