chore(ci): updates runner names in workflows (aws-powertools#2510)

Author: sthulb

.github/actionlint.yaml

@@ -1,5 +1,4 @@
 self-hosted-runner:
   labels:
-    - aws-lambda-powertools_ubuntu-latest_4-core
-    - aws-lambda-powertools_ubuntu-latest_8-core
-    - aws-lambda-powertools_ubuntu-latest_16-core
+    - aws-powertools_ubuntu-latest_4-core 
+    - aws-powertools_ubuntu-latest_8-core

.github/workflows/publish_v2_layer.yml

@@ -57,7 +57,7 @@ jobs:
       id-token: write
       pages: none
       pull-requests: none
-    runs-on: aws-lambda-powertools_ubuntu-latest_8-core
+    runs-on: aws-powertools_ubuntu-latest_8-core
     defaults:
       run:
         working-directory: ./layer

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

@@ -37,7 +37,7 @@ concurrency: e2e
 
 jobs:
   run:
-    runs-on: aws-lambda-powertools_ubuntu-latest_8-core
+    runs-on: aws-powertools_ubuntu-latest_8-core
     permissions:
       id-token: write # needed to request JWT with GitHub's OIDC Token endpoint. docs: https://bit.ly/3MNgQO9
       contents: read  # checkout code