[CI/CD] Use remote PR test template from sonic-mgmt master to run PR test (#15975)

Why I did it
Use remote PR test template from sonic-mgmt master to run PR test.

How I did it
Modify PR test azure pipeline yml file.

How to verify it
PR test executing normally.

Signed-off-by: Chun'ang Li <[email protected]>

Author: lerry-lee

azure-pipelines.yml

@@ -28,6 +28,7 @@ resources:
   - repository: sonic-mgmt
     type: github
     name: sonic-net/sonic-mgmt
+    ref: master
     endpoint: sonic-net
   - repository: buildimage
     type: github
@@ -152,26 +153,26 @@ stages:
     timeoutInMinutes: 240
     continueOnError: false
     steps:
-    - template: .azure-pipelines/run-test-scheduler-template.yml
+    - template: .azure-pipelines/run-test-elastictest-template.yml@sonic-mgmt
       parameters:
         TOPOLOGY: t0
         MIN_WORKER: $(T0_INSTANCE_NUM)
         MAX_WORKER: $(T0_INSTANCE_NUM)
-        MGMT_BRANCH: master
+        MGMT_BRANCH: "master"
 
   - job: t0_2vlans_elastictest
     pool: ubuntu-20.04
     displayName: "kvmtest-t0-2vlans by Elastictest"
     timeoutInMinutes: 240
     continueOnError: false
     steps:
-    - template: .azure-pipelines/run-test-scheduler-template.yml
+    - template: .azure-pipelines/run-test-elastictest-template.yml@sonic-mgmt
       parameters:
         TOPOLOGY: t0
         TEST_SET: t0-2vlans
         MIN_WORKER: $(T0_2VLANS_INSTANCE_NUM)
         MAX_WORKER: $(T0_2VLANS_INSTANCE_NUM)
-        MGMT_BRANCH: master
+        MGMT_BRANCH: "master"
         DEPLOY_MG_EXTRA_PARAMS: "-e vlan_config=two_vlan_a"
 
   - job: t1_lag_elastictest
@@ -180,40 +181,40 @@ stages:
     timeoutInMinutes: 240
     continueOnError: false
     steps:
-    - template: .azure-pipelines/run-test-scheduler-template.yml
+    - template: .azure-pipelines/run-test-elastictest-template.yml@sonic-mgmt
       parameters:
         TOPOLOGY: t1-lag
         MIN_WORKER: $(T1_LAG_INSTANCE_NUM)
         MAX_WORKER: $(T1_LAG_INSTANCE_NUM)
-        MGMT_BRANCH: master
+        MGMT_BRANCH: "master"
 
   - job: multi_asic_elastictest
     displayName: "kvmtest-multi-asic-t1-lag by Elastictest"
     pool: ubuntu-20.04
     timeoutInMinutes: 240
     continueOnError: false
     steps:
-      - template: .azure-pipelines/run-test-scheduler-template.yml
+      - template: .azure-pipelines/run-test-elastictest-template.yml@sonic-mgmt
         parameters:
           TOPOLOGY: t1-8-lag
           TEST_SET: multi-asic-t1-lag
           MIN_WORKER: $(MULTI_ASIC_INSTANCE_NUM)
           MAX_WORKER: $(MULTI_ASIC_INSTANCE_NUM)
           NUM_ASIC: 4
-          MGMT_BRANCH: master
+          MGMT_BRANCH: "master"
 
   - job: dualtor_elastictest
     pool: ubuntu-20.04
     displayName: "kvmtest-dualtor-t0 by Elastictest"
     timeoutInMinutes: 240
     continueOnError: false
     steps:
-      - template: .azure-pipelines/run-test-scheduler-template.yml
+      - template: .azure-pipelines/run-test-elastictest-template.yml@sonic-mgmt
         parameters:
           TOPOLOGY: dualtor
           MIN_WORKER: $(T0_DUALTOR_INSTANCE_NUM)
           MAX_WORKER: $(T0_DUALTOR_INSTANCE_NUM)
-          MGMT_BRANCH: master
+          MGMT_BRANCH: "master"
           COMMON_EXTRA_PARAMS: "--disable_loganalyzer "
 
   - job: sonic_t0_elastictest
@@ -222,13 +223,13 @@ stages:
     timeoutInMinutes: 240
     continueOnError: false
     steps:
-      - template: .azure-pipelines/run-test-scheduler-template.yml
+      - template: .azure-pipelines/run-test-elastictest-template.yml@sonic-mgmt
         parameters:
           TOPOLOGY: t0-64-32
           MIN_WORKER: $(T0_SONIC_INSTANCE_NUM)
           MAX_WORKER: $(T0_SONIC_INSTANCE_NUM)
           TEST_SET: t0-sonic
-          MGMT_BRANCH: master
+          MGMT_BRANCH: "master"
           COMMON_EXTRA_PARAMS: "--neighbor_type=sonic "
           VM_TYPE: vsonic