[Backport 8.8] Stop running integration tests on PRs (#1911)

Co-authored-by: Josh Mock <joshua.mock@elastic.co>

.buildkite/pipeline.yml

@@ -12,7 +12,6 @@ steps:
           - "free"
           - "platinum"
         nodejs:
-          - "14"
           - "16"
           - "18"
           - "20"

catalog-info.yaml

@@ -33,6 +33,8 @@ spec:
           access_level: MANAGE_BUILD_AND_READ
         everyone:
           access_level: READ_ONLY
+      provider_settings:
+        build_pull_requests: false
       cancel_intermediate_builds: true
       cancel_intermediate_builds_branch_filter: '!main'
       schedules:
@@ -45,9 +47,3 @@ spec:
         8_7_daily:
           branch: '8.7'
           cronline: '@daily'
-        8_6_daily:
-          branch: '8.6'
-          cronline: '@daily'
-        7_17_daily:
-          branch: '7.17'
-          cronline: '@daily'