JFrog Self-hosted integration, fix logs and metrics dashboards. (#2436)

* JFrog Self-hosted integration, fix logs and metrics dashboards.

* Update jfrog_platform_self_hosted/assets/dashboards/jfrog_artifactory_metrics_(self-hosted).json

Co-authored-by: May Lee <may.lee@datadoghq.com>

* JFrog Self-hosted integration - update config validation file

---------

Co-authored-by: May Lee <may.lee@datadoghq.com>
Co-authored-by: Ben Harosh <benjamin.har@gmail.com>

jfrog_platform_self_hosted/assets/dashboards/jfrog_artifactory_logs_(self-hosted).json

@@ -7,13 +7,13 @@
             "available_values": [],
             "default": "*",
             "name": "ip_address",
-            "prefix": "@ip_address"
+            "prefix": "@network.client.ip"
         },
         {
             "available_values": [],
             "default": "*",
             "name": "username",
-            "prefix": "@user_name"
+            "prefix": "@usr.id"
         },
         {
             "available_values": [],