Tag docker-sonic-mgmt:latest before push to docker registry (sonic-net#22453)

Why I did it
Latest sonic-mgmt docker build pipeline is failing in upload docker image with error message:

##[error]An image does not exist locally with the tag: ***-microsoft.azurecr.io/docker-sonic-mgmt

How I did it
Tag docker-sonic-mgmt:latest before push to docker registry

How to verify it
Verified with pipeline

Author: xwjiang-ms

.azure-pipelines/docker-sonic-mgmt.yml

@@ -54,7 +54,8 @@ stages:
     - bash: |
         set -xe
         git submodule update --init --recursive -- src/sonic-platform-daemons src/sonic-genl-packet src/sonic-sairedis src/ptf src/sonic-device-data src/sonic-dash-api
-        make SONIC_BUILD_JOBS=$(nproc) DEFAULT_CONTAINER_REGISTRY=publicmirror.azurecr.io ENABLE_DOCKER_BASE_PULL=y configure PLATFORM=generic
+
+        make SONIC_BUILD_JOBS=$(nproc) DEFAULT_CONTAINER_REGISTRY=publicmirror.azurecr.io ENABLE_DOCKER_BASE_PULL=y configure PLATFORM=generic DOCKER_BUILDKIT=0
         make -f Makefile.work BLDENV=bullseye SONIC_BUILD_JOBS=$(nproc) DEFAULT_CONTAINER_REGISTRY=publicmirror.azurecr.io ENABLE_DOCKER_BASE_PULL=y LEGACY_SONIC_MGMT_DOCKER=n target/docker-sonic-mgmt.gz
         cp target -r $(Build.ArtifactStagingDirectory)/target
         docker load -i target/docker-sonic-mgmt.gz
@@ -96,6 +97,14 @@ stages:
         docker exec sonic-mgmt bash -c "echo 'Container is running' && ps aux"
       displayName: 'Setup sonic-mgmt docker container and verify'
 
+    - bash: |
+        set -ex
+
+        docker tag docker-sonic-mgmt:latest $REGISTRY_SERVER/docker-sonic-mgmt:latest
+      env:
+        REGISTRY_SERVER: ${{ parameters.registry_url }}
+      displayName: 'Tag docker-sonic-mgmt'
+
     - task: Docker@2
       displayName: Upload image
       condition: succeeded()