Start startup_tsa_tsb.service only if services.conf file exists (#20315)

Fix #20049

Currently, the startup_tsa_tsb.service is started for all the platforms and the service exists if startup-tsa-tsb.conf doesn't exist for the platform.

Signed-off-by: saksarav <[email protected]>

Author: saksarav-nokia

device/nokia/x86_64-nokia_ixr7250e_36x400g-r0/services.conf

@@ -0,0 +1 @@
+startup_tsa_tsb.service

files/build_templates/sonic_debian_extension.j2

@@ -1039,7 +1039,6 @@ sudo LANG=C cp $SCRIPTS_DIR/write_standby.py $FILESYSTEM_ROOT/usr/local/bin/writ
 sudo LANG=C cp $SCRIPTS_DIR/mark_dhcp_packet.py $FILESYSTEM_ROOT/usr/local/bin/mark_dhcp_packet.py
 
 sudo cp files/build_templates/startup_tsa_tsb.service $FILESYSTEM_ROOT_USR_LIB_SYSTEMD_SYSTEM/
-echo "startup_tsa_tsb.service" | sudo tee -a $GENERATED_SERVICE_FILE
 
 sudo cp $BUILD_TEMPLATES/sonic.target $FILESYSTEM_ROOT_USR_LIB_SYSTEMD_SYSTEM
 sudo LANG=C chroot $FILESYSTEM_ROOT systemctl enable sonic.target

files/build_templates/startup_tsa_tsb.service

@@ -3,7 +3,6 @@ Description= STARTUP TSA-TSB SERVICE
 Requires=config-setup.service database.service
 After=config-setup.service database.service
 Before=bgp.service
-ConditionPathExists=!/etc/sonic/chassisdb.conf
 
 [Service]
 Environment="STARTED_BY_TSA_TSB_SERVICE=1"