[branch-2.1] Picks "[opt](autoinc) Remove some restrictions on schema change on table that has auto-increment column #40280" (#41096)

picks https://github.com/apache/doris/pull/40280

fe/fe-core/src/main/java/org/apache/doris/alter/SchemaChangeHandler.java

@@ -718,12 +718,6 @@ public class SchemaChangeHandler extends AlterHandler {
         } // end for handling other indices
 
         if (typeChanged && !lightSchemaChange) {
-            Optional<Column> autoIncCol = olapTable.getBaseSchema(true).stream()
-                    .filter(col -> col.isAutoInc()).findFirst();
-            if (autoIncCol.isPresent()) {
-                throw new DdlException("Can not modify column " + modColumn.getName() + " becasue table "
-                        + olapTable.getName() + " has auto-increment column " + autoIncCol.get().getName());
-            }
             /*
              * In new alter table process (AlterJobV2), any modified columns are treated as new columns.
              * But the modified columns' name does not changed. So in order to distinguish this, we will add