👷 Simplify pull request workflow triggers (#15836)

.github/workflows/build-docs.yml

@@ -4,10 +4,6 @@ on:
     branches:
       - master
   pull_request:
-    types:
-      - opened
-      - synchronize
-
 permissions: {}
 
 jobs:

.github/workflows/pre-commit.yml

@@ -2,10 +2,6 @@ name: pre-commit
 
 on:
   pull_request:
-    types:
-      - opened
-      - synchronize
-
 permissions: {}
 
 env:

.github/workflows/test-redistribute.yml

@@ -5,10 +5,6 @@ on:
     branches:
       - master
   pull_request:
-    types:
-      - opened
-      - synchronize
-
 permissions: {}
 
 jobs:

.github/workflows/test.yml

@@ -5,9 +5,6 @@ on:
     branches:
       - master
   pull_request:
-    types:
-      - opened
-      - synchronize
   schedule:
     # cron every week on monday
     - cron: "0 0 * * 1"