[8.x] [ci] More resources for check oas snapshot (#198433) (#198436)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[ci] More resources for check oas snapshot
(#198433)](#198433)

<!--- Backport version: 9.4.3 -->

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

<!--BACKPORT
[{"author":{"name":"Jon","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-10-30T19:16:58Z","message":"[ci]
More resources for check oas snapshot (#198433)\n\nThis step doesn't
have enough CPU/memory for the number of
processes\r\nrunning.","sha":"a0a4b422ad1d7ffa7cb34ba67ca86e08673598bf","branchLabelMapping":{"^v9.0.0$":"main","^v8.17.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","v9.0.0","skip-ci","backport:prev-minor"],"title":"[ci]
More resources for check oas
snapshot","number":198433,"url":"https://github.com/elastic/kibana/pull/198433","mergeCommit":{"message":"[ci]
More resources for check oas snapshot (#198433)\n\nThis step doesn't
have enough CPU/memory for the number of
processes\r\nrunning.","sha":"a0a4b422ad1d7ffa7cb34ba67ca86e08673598bf"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/198433","number":198433,"mergeCommit":{"message":"[ci]
More resources for check oas snapshot (#198433)\n\nThis step doesn't
have enough CPU/memory for the number of
processes\r\nrunning.","sha":"a0a4b422ad1d7ffa7cb34ba67ca86e08673598bf"}}]}]
BACKPORT-->

Co-authored-by: Jon <[email protected]>
Co-authored-by: Brad White <[email protected]>

.buildkite/pipelines/on_merge.yml

@@ -398,7 +398,7 @@ steps:
       image: family/kibana-ubuntu-2004
       imageProject: elastic-images-prod
       provider: gcp
-      machineType: n2-standard-2
+      machineType: n2-standard-4
       preemptible: true
     timeout_in_minutes: 60
     retry:

.buildkite/pipelines/pull_request/base.yml

@@ -112,7 +112,7 @@ steps:
   - command: .buildkite/scripts/steps/checks/capture_oas_snapshot.sh
     label: 'Check OAS Snapshot'
     agents:
-      machineType: n2-standard-2
+      machineType: n2-standard-4
       preemptible: true
     timeout_in_minutes: 60
     retry: