Add new key vault variable for phone number (Azure#20729)

Co-authored-by: Minnie Liu <[email protected]>

Author: minnieliu

sdk/communication/tests.yml

@@ -25,7 +25,7 @@ extends:
       AZURE_CLIENT_ID: $(COMMUNICATION_CLIENT_ID)
       AZURE_CLIENT_SECRET: $(COMMUNICATION_CLIENT_SECRET)
       AZURE_COMMUNICATION_LIVETEST_CONNECTION_STRING: $(communication-livetest-connection-string)
-      AZURE_PHONE_NUMBER: $(communication-livetest-phone-number)
+      AZURE_PHONE_NUMBER: $(net-communication-livetest-phone-number)
       # SKIP_PHONENUMBER_LIVE_TESTS skips certain phone number tests such as purchase and release
       SKIP_PHONENUMBER_LIVE_TESTS: TRUE
       TEST_PACKAGES_ENABLED: ${{ parameters.TestPackagesEnabled }}