[Azp]: Fix azp on building ubuntu20.04 and sonic-mgmt (#17439)

The Azp failed on ubuntu20.04 and sonic-mgmt building due to sonic-dash-api updating.

Signed-off-by: Ze Gan <ganze718@gmail.com>

.azure-pipelines/azure-pipelines-build-ubuntu-2004.yml

@@ -34,7 +34,7 @@ stages:
         mkdir -p /tmp/artifacts
       displayName: "Install dependencies"
     - script: |
-        SONIC_CONFIG_MAKE_JOBS=$(nproc) CONFIGURED_ARCH=amd64 DEST=/tmp/artifacts make -f ../rules/protobuf.mk -f protobuf/Makefile
+        BLDENV=bullseye SONIC_CONFIG_MAKE_JOBS=$(nproc) CONFIGURED_ARCH=amd64 DEST=/tmp/artifacts make -f ../rules/protobuf.mk -f protobuf/Makefile
       workingDirectory: src
       displayName: "Build protobuf"
     - script: |

dockers/docker-sonic-mgmt/Dockerfile.j2

@@ -228,7 +228,7 @@ RUN mkdir -p /tmp/protobuf \
 # Install dash-api
 RUN cd /tmp \
     && mkdir -p /usr/lib/python3/dist-packages/dash_api \
-    && wget https://raw.githubusercontent.com/sonic-net/sonic-buildimage/master/src/sonic-dash-api/pypkg/__init__.py -O /usr/lib/python3/dist-packages/dash_api/__init__.py \
+    && wget https://raw.githubusercontent.com/sonic-net/sonic-dash-api/master/misc/pypkg/dash_api/__init__.py -O /usr/lib/python3/dist-packages/dash_api/__init__.py \
     && git clone https://github.com/sonic-net/sonic-dash-api.git \
     && protoc -I=sonic-dash-api/proto --python_out=/usr/lib/python3/dist-packages/dash_api sonic-dash-api/proto/*.proto \
     && rm -rf /tmp/sonic-dash-api