Remove services mentioned in exclude service list for system monitori…

…ng (sonic-net#18911)

- Why I did it
To address sonic-net#18814

- How I did it
Introduce exclude service list in the code to be parsed and remove the services from the system ready tracking.
In this case, it is ztp.service

- How to verify it
show system-health sysready-status output

src/system-health/health_checker/sysmonitor.py

@@ -23,7 +23,7 @@
 QUEUE_TIMEOUT = 15
 TASK_STOP_TIMEOUT = 10
 logger = Logger(log_identifier=SYSLOG_IDENTIFIER)
-
+exclude_srv_list = ['ztp.service']
 
 #Subprocess which subscribes to STATE_DB FEATURE table for any update
 #and push service events to main process via queue
@@ -158,6 +158,11 @@ def get_all_service_list(self):
                 if srv in dir_list:
                     dir_list.remove(srv)
 
+	#Remove services from exclude list Eg.ztp.service
+        for srv in exclude_srv_list:
+            if srv in dir_list:
+                dir_list.remove(srv)
+
         dir_list.sort()
         return dir_list