Merge pull request #4624 from ethereum-optimism/feat/cci-sequential-tests

ci: Temporarily disable parallel e2e tests

.circleci/config.yml

@@ -482,7 +482,7 @@ jobs:
           command: |
             # Note: We don't use circle CI test splits because we need to split by test name, not by package. There is an additional
             # constraint that gotestsum does not currently (nor likely will) accept files from different pacakges when building.
-            OP_TESTLOG_DISABLE_COLOR=true OP_E2E_DISABLE_PARALLEL=false OP_E2E_USE_HTTP=<<parameters.use_http>>  gotestsum \
+            OP_TESTLOG_DISABLE_COLOR=true OP_E2E_DISABLE_PARALLEL=true OP_E2E_USE_HTTP=<<parameters.use_http>>  gotestsum \
             --format=standard-verbose --junitfile=/tmp/test-results/<<parameters.module>>_http_<<parameters.use_http>>.xml \
             ./... \
             -- -timeout=20m

op-e2e/system_tob_test.go

@@ -424,6 +424,7 @@ func TestMixedWithdrawalValidity(t *testing.T) {
 	// There are 7 different fields we try modifying to cause a failure, plus one "good" test result we test.
 	for i := 0; i <= 8; i++ {
 		t.Run(fmt.Sprintf("withdrawal test#%d", i+1), func(t *testing.T) {
+			t.Parallel()
 			// Create our system configuration, funding all accounts we created for L1/L2, and start it
 			cfg := DefaultSystemConfig(t)
 			cfg.DeployConfig.FinalizationPeriodSeconds = 6