fix(cron): added logging to differentiate alias vs upstream computati…

…on in cron (#3198)

Indicate when alias computation starts/ends and when upstream
computation starts/ends

gcp/workers/alias/run_cron.sh

@@ -12,6 +12,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+echo "Starting alias computation"
+python3 alias_computation.py
+echo "Completed alias computation"
 
-python3 ./alias_computation.py
-python3 ./upstream_computation.py
+echo "Starting upstream computation"
+python3 upstream_computation.py
+echo "Completed upstream computation"