Don't run tests after a PR is merged

Currently, once Github tests pass and the PR merges in our Google repo,
our workflow merges the PR in Github. Then, after the merge, tests are
again triggered in Github on the main branch. We already have regular
scheduled tests on main, so this isn't needed.

Author: shralex

.github/workflows/CPUTests.yml

@@ -2,8 +2,6 @@ name: Linter
 
 on:
   pull_request:
-  push:
-    branches: [ "main" ]
 
 concurrency:
   # Dedup pull requests (canceling previous runs of the same workflow for same PR), but nothing else

.github/workflows/RunTests.yml

@@ -19,8 +19,6 @@ name: Tests
 
 on:
   pull_request:
-  push:
-    branches: [ "main" ]
   workflow_dispatch:
   schedule:
     # Run the job every 4 hours