[8.18] [ci/ build_pr_and_deploy_cloud] Wait for pre-build (#210202) (#213937)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[ci/ build_pr_and_deploy_cloud] Wait for pre-build
(#210202)](https://github.com/elastic/kibana/pull/210202)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT
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build_pr_and_deploy_cloud] Wait for pre-build (#210202)\n\nbefore
building the distribution. CI stats depends on environment setup\nfrom
the pre-build
step.","sha":"f56e658f0bacb79091a7e837b13db5af01cb4dc1","branchLabelMapping":{"^v9.1.0$":"main","^v8.19.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","v9.0.0","skip-ci","backport:prev-major","ci:cloud-deploy","v9.1.0"],"title":"[ci/
build_pr_and_deploy_cloud] Wait for
pre-build","number":210202,"url":"https://github.com/elastic/kibana/pull/210202","mergeCommit":{"message":"[ci/
build_pr_and_deploy_cloud] Wait for pre-build (#210202)\n\nbefore
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build_pr_and_deploy_cloud] Wait for pre-build (#210202)\n\nbefore
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Co-authored-by: Jon <jon@elastic.co>

.buildkite/pipelines/build_pr_and_deploy_cloud.yml

@@ -34,6 +34,8 @@ steps:
           machineType: n2-standard-2
         timeout_in_minutes: 5
 
+      - wait: ~
+
       - command: .buildkite/scripts/steps/build_kibana.sh
         label: Build Kibana Distribution
         agents:
@@ -45,13 +47,12 @@ steps:
           diskSizeGb: 125
         if: "build.env('KIBANA_BUILD_ID') == null || build.env('KIBANA_BUILD_ID') == ''"
         timeout_in_minutes: 90
+        key: build
         retry:
           automatic:
             - exit_status: '-1'
               limit: 3
 
-      - wait: ~
-
       - command: .buildkite/scripts/steps/cloud/build_and_deploy.sh
         label: 'Build and Deploy to Cloud'
         agents:
@@ -61,6 +62,7 @@ steps:
           machineType: n2-standard-2
           preemptible: true
         timeout_in_minutes: 30
+        depends_on: build
         retry:
           automatic:
             - exit_status: '-1'