Remove echo log to /tmp/{$SERVICE}-debug.log in service_mgmt.sh (#17838)

### Why I did it

Unnecessary for logs to be written out to /tmp/${SERVICE}-debug.log as they are already being written to syslog. Therefore, removing writing to a new log in concern for memory space and not being able to startup some services in RO state.

##### Work item tracking
- Microsoft ADO **(number only)**:26458976

#### How I did it

Remove DEBUGLOG definition and line that echo's message to mentioned log file.

#### How to verify it

Manually verified, /tmp/${SERVICE}-debug.log files do not exist and log for service starting still appears in syslog

files/scripts/service_mgmt.sh

@@ -3,7 +3,6 @@
 function debug()
 {
     /usr/bin/logger $1
-    /bin/echo `date` "- $1" >> ${DEBUGLOG}
 }
 
 function check_warm_boot()
@@ -87,7 +86,6 @@ DEV=$2
 
 SCRIPT_NAME=$(basename -- "$0")
 SERVICE="${SCRIPT_NAME%.*}"
-DEBUGLOG="/tmp/$SERVICE-debug$DEV.log"
 NAMESPACE_PREFIX="asic"
 if [ "$DEV" ]; then
     NET_NS="$NAMESPACE_PREFIX$DEV" #name of the network namespace