stop needless wasting of CI hours with on push triggers we don't need

Author: sam0x17

.github/workflows/check-rust.yml

@@ -5,9 +5,6 @@ concurrency:
   cancel-in-progress: true
 
 on:
-  push:
-    branches: [main, devnet-ready, devnet, testnet, finney]
-
   pull_request:
 
   ## Allow running workflow manually from the Actions tab

.github/workflows/e2e-bittensor-tests.yml

@@ -5,9 +5,6 @@ concurrency:
   cancel-in-progress: true
 
 on:
-  push:
-    branches: [main, devnet-ready, devnet, testnet, finney]
-
   pull_request:
 
   ## Allow running workflow manually from the Actions tab