Serialize test runs (#1826)

## Description

Disable parallel tests to eliminate cases where we get throttled due to multiple test packages running.

Going forward - we could possibly separate out integration from unit tests and have the unit tests run in parallel.

## Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No 

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [x] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

.github/workflows/ci.yml

@@ -175,6 +175,7 @@ jobs:
           -json         \
           -v            \
           -failfast     \
+          -p 1          \
           ./... 2>&1 | tee ./testlog/gotest.log | gotestfmt -hide successful-tests
 
       # Upload the original go test log as an artifact for later review.