chore: add timeout to GHA workflows (#26714)

.github/workflows/backport.yml

@@ -8,6 +8,7 @@ on:
 jobs:
   main:
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     steps:
       - name: Checkout Actions
         uses: actions/checkout@v2

.github/workflows/docs-checker.yml

@@ -6,6 +6,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    timeout-minutes: 10
 
     steps:
       - name: 'Setup Environment'

.github/workflows/patch.yml

@@ -5,6 +5,7 @@ on: [pull_request, workflow_dispatch]
 jobs:
   test:
     runs-on: ubuntu-18.04
+    timeout-minutes: 60
 
     name: Patch Test
 

.github/workflows/server-tests.yml

@@ -9,6 +9,7 @@ on:
 jobs:
   test:
     runs-on: ubuntu-18.04
+    timeout-minutes: 60
 
     strategy:
       fail-fast: false

.github/workflows/ui-tests.yml

@@ -7,6 +7,7 @@ on:
 jobs:
   test:
     runs-on: ubuntu-18.04
+    timeout-minutes: 60
 
     strategy:
       fail-fast: false