[8.16] [ci] Set disk size for artifact builds (#197663) (#201891)

# Backport

This will backport the following commits from `main` to `8.16`:
- [[ci] Set disk size for artifact builds
(#197663)](#197663)

<!--- 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":"2024-11-26T23:35:57Z","message":"[ci]
Set disk size for artifact builds (#197663)\n\nDefines disk size for
artifact builds. This will be a no-op - the boot\r\ndisk size is >= the
definitions in this PR.\r\n\r\nA test run with the smaller boot disk can
be seen
in\r\nhttps://buildkite.com/elastic/kibana-pull-request/builds/248242. I
plan\r\non making further adjustments after the boot disk has been
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Set disk size for artifact
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Set disk size for artifact builds (#197663)\n\nDefines disk size for
artifact builds. This will be a no-op - the boot\r\ndisk size is >= the
definitions in this PR.\r\n\r\nA test run with the smaller boot disk can
be seen
in\r\nhttps://buildkite.com/elastic/kibana-pull-request/builds/248242. I
plan\r\non making further adjustments after the boot disk has been
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Set disk size for artifact builds (#197663)\n\nDefines disk size for
artifact builds. This will be a no-op - the boot\r\ndisk size is >= the
definitions in this PR.\r\n\r\nA test run with the smaller boot disk can
be seen
in\r\nhttps://buildkite.com/elastic/kibana-pull-request/builds/248242. I
plan\r\non making further adjustments after the boot disk has been
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BACKPORT-->

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

.buildkite/pipelines/artifacts.yml

@@ -6,6 +6,7 @@ steps:
       imageProject: elastic-images-prod
       provider: gcp
       machineType: c2-standard-16
+      diskSizeGb: 125
     timeout_in_minutes: 120
     retry:
       automatic:

.buildkite/pipelines/pull_request/base.yml

@@ -12,6 +12,7 @@ steps:
     agents:
       machineType: n2-standard-16
       preemptible: true
+      diskSizeGb: 125
     key: build
     if: "build.env('KIBANA_BUILD_ID') == null || build.env('KIBANA_BUILD_ID') == ''"
     timeout_in_minutes: 90