slow load test frequency to every 4 hours (#1039)

## Description

load testing for the dev m356 tenant takes longer
than 3 hours to complete, causing all load tests to
get canceled when github shifts priority to the
next job that gets kicked off.  Backing off the freq to
every 4 hours, and will revisit that as needed. If 4 hour
time doesn't satisfy the boundary, we should shift the
dataset instead of freqnency.

## Type of change

- [x] 🤖 Test

## Issue(s)

* #902

## Test Plan

- [x] 💚 E2E

.github/workflows/ci.yml

@@ -99,7 +99,7 @@ jobs:
         uses: actions/upload-artifact@v3
         with:
           name: test-log
-          path: testlog/gotest.log
+          path: src/testlog/gotest.log
           if-no-files-found: error
           retention-days: 14
 

.github/workflows/load_test.yml

@@ -3,8 +3,8 @@ on:
   schedule:
     # every day at 01:59 (01:59am) UTC
     # - cron: "59 1 * * *"
-    # temp, for testing: every 3 hours
-    - cron: "0 */3 * * *"
+    # temp, for testing: every 4 hours
+    - cron: "0 */4 * * *"
 
 permissions:
   # required to retrieve AWS credentials