Move test_cont_warm_reboot.py to PR test (#14778)

What is the motivation for this PR?
In this PR, we move test script test_cont_warm_reboot.py to PR test.

How did you do it?
How did you verify/test it?
TestbedName	FilePath	RunDate	SuccessCount	FailureCount	TotalTests	SuccessRate
vms-kvm-t0	platform_tests/test_cont_warm_reboot.py	2024-09-27 00:00:00.0000000	5	0	5	1
vms-kvm-t0	platform_tests/test_cont_warm_reboot.py	2024-09-26 00:00:00.0000000	34	0	34	1

.azure-pipelines/pr_test_scripts.yaml

@@ -218,6 +218,7 @@ t0:
   - wol/test_wol.py
   - dhcp_relay/test_dhcp_pkt_fwd.py
   - telemetry/test_telemetry.py
+  - platform_tests/test_cont_warm_reboot.py
 
 t0-2vlans:
   - dhcp_relay/test_dhcp_relay.py
@@ -455,7 +456,6 @@ onboarding_t0:
   - pfcwd/test_pfcwd_timer_accuracy.py
   - pfcwd/test_pfcwd_warm_reboot.py
   # - platform_tests/test_advanced_reboot.py
-  - platform_tests/test_cont_warm_reboot.py
   - snmp/test_snmp_link_local.py
   - lldp/test_lldp_syncd.py