Re-enable Watcher rest tests (#47692)

This test is believed to be fixed by #43939

closes #43889

Author: jakelandis

x-pack/qa/smoke-test-watcher/src/test/resources/rest-api-spec/test/painless/10_basic.yml

@@ -124,9 +124,6 @@
 
 ---
 "Test execute watch api with rest_total_hits_as_int":
-  - skip:
-      version: "all"
-      reason: "AwaitsFix https://github.com/elastic/elasticsearch/issues/43889"
 
   - do:
       cluster.health: