Fix System health issue which checks frr_bmp in feature table. (#22985)

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#### Why I did it
We need skip frr_bmp since it's not container just bmp option used by bgpd from service checker.

##### Work item tracking
#22934 (comment)

#### How I did it
Skipp frr_bmp from feature table.

#### How to verify it
after frr_bmp feature is enabled, system-health cli does not report frr_bmp in "Not Running" line any more, other containers are not launched which are irrelevant to frr_bmp
![image](https://github.com/user-attachments/assets/e1477c33-a979-4640-9c36-301c9d800ebb)

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Author: mssonicbld

src/system-health/health_checker/service_checker.py

@@ -99,6 +99,9 @@ def get_expected_running_containers(self, feature_table):
 
         container_list = []
         for container_name in feature_table.keys():
+            # skip frr_bmp since it's not container just bmp option used by bgpd
+            if container_name == "frr_bmp":
+                continue
             # slim image does not have telemetry container and corresponding docker image
             if container_name == "telemetry":
                 ret = check_docker_image("docker-sonic-telemetry")