Update usage to make sure text_embedding function is present in non-snapshot builds.

Author: afoucret

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/60_usage.yml

@@ -259,6 +259,7 @@ setup:
   - set: { esql.functions.to_long: functions_to_long }
   - set: { esql.functions.coalesce: functions_coalesce }
   - set: { esql.functions.categorize: functions_categorize }
+  - set: {esql.functions.text_embedding: functions_text_embedding}
 
   - do:
       esql.query:
@@ -302,6 +303,7 @@ setup:
   - gt: { esql.functions.to_long: $functions_to_long }
   - match: { esql.functions.coalesce: $functions_coalesce }
   - gt: { esql.functions.categorize: $functions_categorize }
+  - match: {esql.functions.text_embedding: $functions_text_embedding}
 
   - set: { esql.features.limit: limit_counter }
   - set: { esql.features.sort: sort_counter }