fix: pass ROBUSTA_API_ENDPOINT to runner on self-hosted installs

The runner reads ROBUSTA_API_ENDPOINT to build URLs like
RUNNER_GET_HOLMES_SLACKBOT_INFO and RUNNER_GET_INFO_URL. On self-hosted
clusters this var was not injected, so the runner fell back to the
public api.robusta.dev instead of the customer's api.<MY_DOMAIN>.

Inject it from BackendProfile.robusta_cloud_api_host alongside the
other self-host endpoint overrides in gen_config.

Author: naomi-robusta

robusta_cli/main.py

@@ -274,6 +274,10 @@ def gen_config(
                 "name": "ROBUSTA_TELEMETRY_ENDPOINT",
                 "value": backend_profile.robusta_telemetry_endpoint,
             },
+            {
+                "name": "ROBUSTA_API_ENDPOINT",
+                "value": backend_profile.robusta_cloud_api_host,
+            },
         ]
 
     if is_small_cluster: