fix: rename idp_templates6_ldap3 to ldap2 if necessary (#9565)

# Which Problems Are Solved

Zitadel setup with v2.71.0 could result in errors regarding the
idp_templates6_ldap3 subtable.

# How the Problems Are Solved

Rename the subtable idp_templates6_ldap3 to idp_templates6_ldap2 if no
idp_templates6_ldap2 is existing and rename column `rootCA` to
`root_ca`.

# Additional Changes

None

# Additional Context

Related PR #9292

---------

Co-authored-by: Silvan <27845747+adlerhurst@users.noreply.github.com>

cmd/setup/52.go

@@ -0,0 +1,27 @@
+package setup
+
+import (
+	"context"
+	_ "embed"
+
+	"github.com/zitadel/zitadel/internal/database"
+	"github.com/zitadel/zitadel/internal/eventstore"
+)
+
+var (
+	//go:embed 52.sql
+	renameTableIfNotExisting string
+)
+
+type IDPTemplate6LDAP2 struct {
+	dbClient *database.DB
+}
+
+func (mig *IDPTemplate6LDAP2) Execute(ctx context.Context, _ eventstore.Event) error {
+	_, err := mig.dbClient.ExecContext(ctx, renameTableIfNotExisting)
+	return err
+}
+
+func (mig *IDPTemplate6LDAP2) String() string {
+	return "52_idp_templates6_ldap2"
+}