[8.11] [ci/pull_requests] Disable kibana-kme-test (#169238) (#169568)

# Backport

This will backport the following commits from `main` to `8.11`:
- [[ci/pull_requests] Disable kibana-kme-test
(#169238)](#169238)

<!--- Backport version: 8.9.7 -->

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

<!--BACKPORT
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Disable kibana-kme-test (#169238)\n\nIntroduced in
https://github.com/elastic/kibana/pull/157334\r\n\r\nThis pipeline
was/(is?) used for testing the new buildkite system. We're\r\nrunning
into an issue where `trigger_comment_regex` matches on both
the\r\nlegacy and new systems, triggering builds in both. GitHub checks
can end\r\nup conflicting making it difficult to find the correct build
link.\r\n\r\nThis disables the pr integration for kibana-kme-test. If
we're done with\r\nthe testing pipeline we can remove it, if not we can
change the trigger\r\nword. I'm not sure what the current status is,
ping
@elastic/ci-systems\r\n.","sha":"0ec93317c1d099e29dbfac2327df449cc1da0a40","branchLabelMapping":{"^v8.12.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","backport:prev-minor","v8.12.0"],"number":169238,"url":"https://github.com/elastic/kibana/pull/169238","mergeCommit":{"message":"[ci/pull_requests]
Disable kibana-kme-test (#169238)\n\nIntroduced in
https://github.com/elastic/kibana/pull/157334\r\n\r\nThis pipeline
was/(is?) used for testing the new buildkite system. We're\r\nrunning
into an issue where `trigger_comment_regex` matches on both
the\r\nlegacy and new systems, triggering builds in both. GitHub checks
can end\r\nup conflicting making it difficult to find the correct build
link.\r\n\r\nThis disables the pr integration for kibana-kme-test. If
we're done with\r\nthe testing pipeline we can remove it, if not we can
change the trigger\r\nword. I'm not sure what the current status is,
ping
@elastic/ci-systems\r\n.","sha":"0ec93317c1d099e29dbfac2327df449cc1da0a40"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.12.0","labelRegex":"^v8.12.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/169238","number":169238,"mergeCommit":{"message":"[ci/pull_requests]
Disable kibana-kme-test (#169238)\n\nIntroduced in
https://github.com/elastic/kibana/pull/157334\r\n\r\nThis pipeline
was/(is?) used for testing the new buildkite system. We're\r\nrunning
into an issue where `trigger_comment_regex` matches on both
the\r\nlegacy and new systems, triggering builds in both. GitHub checks
can end\r\nup conflicting making it difficult to find the correct build
link.\r\n\r\nThis disables the pr integration for kibana-kme-test. If
we're done with\r\nthe testing pipeline we can remove it, if not we can
change the trigger\r\nword. I'm not sure what the current status is,
ping
@elastic/ci-systems\r\n.","sha":"0ec93317c1d099e29dbfac2327df449cc1da0a40"}}]}]
BACKPORT-->

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

.buildkite/pull_requests.json

@@ -55,7 +55,7 @@
       "repoName": "kibana",
       "pipelineSlug": "kibana-kme-test",
 
-      "enabled": true,
+      "enabled": false,
       "allow_org_users": true,
       "allowed_repo_permissions": ["admin", "write"],
       "allowed_list": ["barlowm", "renovate[bot]"],