[8.x] fix(slo): Override transform _id to ensure uniqness (#198610)

[kibanamachine]

Backport

This will backport the following commits from main to 8.x:

• fix(slo): Override transform _id to ensure uniqness (#198610)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[github-actions]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 9255fae

Failed CI Steps

• test/functional/apps/discover/group3/config.ts

Test Failures

• [job] [logs] test/functional/apps/discover/group3/config.ts / discover/group3 discover lens vis should show no histogram for non-time-based data views and recover for time-based data views

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
observability	471.0KB	471.3KB	+294.0B
slo	856.1KB	856.3KB	+294.0B
synthetics	1.1MB	1.1MB	+294.0B
total			+882.0B

cc @kdelemme