[fleet] add pipeline for daily package install test (#128683)

* [fleet] add pipeline for daily package install test

* use install_all_packages script and make sure it's executable

.buildkite/pipelines/fleet/packages_daily.yml

@@ -0,0 +1,33 @@
+steps:
+  - command: .buildkite/scripts/lifecycle/pre_build.sh
+    label: Pre-Build
+    timeout_in_minutes: 10
+    agents:
+      queue: kibana-default
+
+  - wait
+
+  - command: .buildkite/scripts/steps/build_kibana.sh
+    label: Build Kibana Distribution and Plugins
+    agents:
+      queue: c2-16
+    key: build
+    if: "build.env('KIBANA_BUILD_ID') == null || build.env('KIBANA_BUILD_ID') == ''"
+    timeout_in_minutes: 60
+
+  - wait
+
+  - command: .buildkite/scripts/steps/fleet/install_all_packages.sh
+    label: Install All Packages
+    agents:
+      queue: n2-2
+    key: linting
+    timeout_in_minutes: 90
+
+  - wait: ~
+    continue_on_failure: true
+
+  - label: Post-Build
+    command: .buildkite/scripts/lifecycle/post_build.sh
+    agents:
+      queue: kibana-default

.buildkite/scripts/steps/fleet/install_all_packages.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+source .buildkite/scripts/common/util.sh
+
+.buildkite/scripts/bootstrap.sh
+
+echo '--- Installing all packages'
+cd x-pack/plugins/fleet
+node scripts/install_all_packages