Fix TSA-TSB race condition on multi-asic platforms (sonic-net#710)

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#### Why I did it
Fixes sonic-net#21816

##### Work item tracking
- Microsoft ADO **31499777**:

#### How I did it
Setting the STATE_DB ALL_SERVICE_STATUS|tsa_tsb_service flag first as part of startup_tsa_tsb service, followed by configuring TSA.
And as part of the case, when tsa_ena is False (genuine or due to race condition), we explictly call TSA again to ensure all asics go to TSA state.
#### How to verify it
Reboot the multi-asic linecard, and validate that all asics are in TSA state and TSA-TSB timer is running
config_reload

Tested following scenarios:
1. reboot multi-asic linecard
2. config reload
3. execute TSA while the service is running
4. TSA, config save and then config_reload
5. execute TSB while the service is running
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20240532.08
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files/scripts/startup_tsa_tsb.py

@@ -67,12 +67,12 @@ def config_tsa():
     num_asics = multi_asic.get_num_asics()
     tsa_ena = get_tsa_status(num_asics)
     if tsa_ena == True:
-        logger.log_info("Configuring TSA")
-        subprocess.check_output(['TSA']).strip()
         logger.log_info("Setting TSA-TSB service field in STATE_DB")
         subprocess.check_output([
             'sonic-db-cli', 'STATE_DB', 'HSET', 'ALL_SERVICE_STATUS|tsa_tsb_service', 'running', 'OK'
         ]).strip()
+        logger.log_info("Configuring TSA")
+        subprocess.check_output(['TSA']).strip()
     else:
         #check if tsa_tsb service is already running, restart the timer
         try:
@@ -84,6 +84,8 @@ def config_tsa():
 
         if startup_tsa_tsb_service_status == 'OK':
             logger.log_info("TSA-TSB service is already running, just restart the timer")
+            # execute TSA again: this is to overcome race condition where in its previous run, TSA configuration didnt complete on all asics
+            subprocess.check_output(['TSA']).strip()
             return True
         else:
             if num_asics > 1: