Enable direct sync in CI to bypass QStash bottleneck

With STACK_EXTERNAL_DB_SYNC_DIRECT=false, all syncs go through
QStash with parallelism: 20. The ~672 user creations across 79
parallel test files generate hundreds of sync requests that can
saturate QStash, starving individual test tenancies.

Set STACK_EXTERNAL_DB_SYNC_DIRECT=true in all 6 CI workflow files
so the poller calls the sync-engine endpoint directly (via HTTP to
the local backend) instead of going through QStash.

Author: BilalG1

.github/workflows/e2e-api-tests.yaml

@@ -20,7 +20,7 @@ jobs:
       STACK_ENABLE_HARDCODED_PASSKEY_CHALLENGE_FOR_TESTING: yes
       STACK_DATABASE_CONNECTION_STRING: "postgres://postgres:PASSWORD-PLACEHOLDER--uqfEC1hmmv@localhost:8128/stackframe"
       STACK_EXTERNAL_DB_SYNC_MAX_DURATION_MS: "20000"
-      STACK_EXTERNAL_DB_SYNC_DIRECT: "false"
+      STACK_EXTERNAL_DB_SYNC_DIRECT: "true"
 
     strategy:
       matrix:

.github/workflows/e2e-custom-base-port-api-tests.yaml

@@ -20,7 +20,7 @@ jobs:
       STACK_DATABASE_CONNECTION_STRING: "postgres://postgres:PASSWORD-PLACEHOLDER--uqfEC1hmmv@localhost:6728/stackframe"
       NEXT_PUBLIC_STACK_PORT_PREFIX: "67"
       STACK_EXTERNAL_DB_SYNC_MAX_DURATION_MS: "20000"
-      STACK_EXTERNAL_DB_SYNC_DIRECT: "false"
+      STACK_EXTERNAL_DB_SYNC_DIRECT: "true"
 
     strategy:
       matrix:

.github/workflows/restart-dev-and-test-with-custom-base-port.yaml

@@ -20,7 +20,7 @@ jobs:
     env:
       NEXT_PUBLIC_STACK_PORT_PREFIX: "69"
       STACK_EXTERNAL_DB_SYNC_MAX_DURATION_MS: "20000"
-      STACK_EXTERNAL_DB_SYNC_DIRECT: "false"
+      STACK_EXTERNAL_DB_SYNC_DIRECT: "true"
 
     steps:
       - uses: actions/checkout@v6

.github/workflows/restart-dev-and-test.yaml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubicloud-standard-16
     env:
       STACK_EXTERNAL_DB_SYNC_MAX_DURATION_MS: "20000"
-      STACK_EXTERNAL_DB_SYNC_DIRECT: "false"
+      STACK_EXTERNAL_DB_SYNC_DIRECT: "true"
 
     steps:
       - uses: actions/checkout@v6

.github/workflows/setup-tests-with-custom-base-port.yaml

@@ -20,7 +20,7 @@ jobs:
     env:
       NEXT_PUBLIC_STACK_PORT_PREFIX: "69"
       STACK_EXTERNAL_DB_SYNC_MAX_DURATION_MS: "20000"
-      STACK_EXTERNAL_DB_SYNC_DIRECT: "false"
+      STACK_EXTERNAL_DB_SYNC_DIRECT: "true"
 
     steps:
       - uses: actions/checkout@v6

.github/workflows/setup-tests.yaml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubicloud-standard-16
     env:
       STACK_EXTERNAL_DB_SYNC_MAX_DURATION_MS: "20000"
-      STACK_EXTERNAL_DB_SYNC_DIRECT: "false"
+      STACK_EXTERNAL_DB_SYNC_DIRECT: "true"
     steps:
       - uses: actions/checkout@v6