Turn off propagation when no option is specified on a tag, fix multi-select bug

packages/migration-assistant-import/src/main/kotlin/CSVReader.kt

@@ -108,7 +108,6 @@ class CSVReader @JvmOverloads constructor(path: String, fieldSeparator: Char = '
                     if (assets.delete.isNotEmpty()) {
                         deferDeletes[id]!![asset.guid] = assets.delete
                     }
-                    // TODO: Handle non-idempotent Atlan tags
                 } catch (e: AtlanException) {
                     logger.error("Unable to load batch.", e)
                 }

pkg-config/src/main/kotlin/com/atlan/pkg/config/widgets/DropDown.kt

@@ -35,7 +35,7 @@ class DropDown(
 ) {
     private class DropDownWidget(
         label: String,
-        mode: String,
+        val mode: String,
         hidden: Boolean = false,
         help: String = "",
         grid: Int,

serde/src/main/kotlin/xformers/cell/AtlanTagXformer.kt

@@ -48,6 +48,9 @@ object AtlanTagXformer {
                 "HIERARCHY_ONLY" -> builder.propagate(true).removePropagationsOnEntityDelete(true).restrictPropagationThroughLineage(true)
                 else -> builder.propagate(false)
             }
+        } else {
+            // If there is no propagation option specified, turn off propagation
+            builder.propagate(false)
         }
         return builder.build()
     }