Revert "Run vol limited arb test on push"

This reverts commit 0409bec.

We need to kick this off manually because some significant
proportion of the time, the github generated results will
not be consistent across runners due to either
architectural or OS-level differences.

.github/workflows/volume_limited_arb.yml

@@ -1,11 +1,8 @@
 name: Run volume limited arbitrage pipeline
 
-on:
-  push:
-    branches: [ main, develop ]
-  pull_request:
-    branches: [ main, develop ]
-  workflow_dispatch:
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the main and develop branches.
+on: workflow_dispatch
 
 jobs:
   build: