Remove the push trigger on Rust testing CI

This is still being triggered by non-rust commits, need to look into this further later.

Fixes #6378

Author: emesare

.github/workflows/rust_testing.yml

@@ -7,13 +7,6 @@ name: Rust Testing
 
 on:
   workflow_dispatch:
-  push:
-    branches:
-      - '**'
-    paths:
-      - '**.rs'
-      - '**.toml'
-      - 'rust/**'
   # Pull request target allows us to use the bn license and serial for PR's
   # to insure we do not leak the license the workflow is required to be approved manually.
   pull_request_target: