chore(tags): don't allow users to create new tags from property dropdowns (apache#25507)

Author: hughhhh

superset-frontend/src/dashboard/components/PropertiesModal/index.tsx

@@ -741,7 +741,6 @@ const PropertiesModal = ({
                 <AsyncSelect
                   ariaLabel="Tags"
                   mode="multiple"
-                  allowNewOptions
                   value={tagsAsSelectValues}
                   options={loadTags}
                   onChange={handleChangeTags}

superset-frontend/src/explore/components/PropertiesModal/index.tsx

@@ -434,7 +434,6 @@ function PropertiesModal({
                 <AsyncSelect
                   ariaLabel="Tags"
                   mode="multiple"
-                  allowNewOptions
                   value={tagsAsSelectValues}
                   options={loadTags}
                   onChange={handleChangeTags}