[Fix](regression) Fix flaky test `fault_injection_p0/cloud/test_cloud…

…_mow_stale_resp_load_load_conflict` (#43448)

Problem Summary: `ADMIN SET FRONTEND CONFIG()` will only update the
config of the connected FE, which may lead to unexpected result for some
cases if the connected FE is not master FE. should use `ADMIN SET
FRONTEND CONFIG()` instead.

regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy

@@ -1622,7 +1622,7 @@ class Suite implements GroovyInterceptable {
     }
 
     void setFeConfig(String key, Object value) {
-        sql "ADMIN SET FRONTEND CONFIG ('${key}' = '${value}')"
+        sql "ADMIN SET ALL FRONTEND CONFIG ('${key}' = '${value}')"
     }
 
     void setFeConfigTemporary(Map<String, Object> tempConfig, Closure actionSupplier) {