cloud: Load submissions into PostgreSQL only, faster

Remove loading submissions into BigQuery until we come up with a way to
increase throughput (likely pulling chunks from PostgreSQL). This should
help us deal with the backlog in production submission queue.

We might also need to either switch to direct triggering of Cloud
Functions by messages from the queue, to reduce latency, or simply
switch to a persistent Cloud Run service.

Concerns: #541

cloud

@@ -217,14 +217,7 @@ function execute_command() {
     fi
     declare -a -r bigquery_args
 
-    declare -r database=$(
-        echo -n "mux: "
-        echo -n "$psql_kcidb_db" | escape_whitespace
-        echo -n " "
-        echo -n "$bigquery_kcidb_db" | escape_whitespace
-        echo -n " "
-        echo -n "$bigquery_sample_kcidb_db" | escape_whitespace
-    )
+    declare -r database="$psql_kcidb_db"
 
     if "$test"; then
         declare -r sqlite_clean_test_file="$TMPDIR/clean.sqlite3"

kcidb/cloud/functions.sh

@@ -228,7 +228,7 @@ function functions_deploy() {
                     --env-vars-file "$env_yaml_file" \
                     --trigger-topic "${load_queue_trigger_topic}" \
                     --memory 1024MB \
-                    --max-instances=1 \
+                    --max-instances=4 \
                     --timeout 540
     # Remove the environment YAML file
     rm "$env_yaml_file"