[Moving] Move Infra folder into /x-pack/observability_solution

[CoenWarmer]

Summary

This PR is part of the initiative to consolidate Observability plugins into x-pack/plugins/observability_solution.

This PR is strictly a move and an update in references.

This was discussed and agreed upon with the Observability org in the Observability Office Hours meeting at the end of 2023.

Related PRs:

• Move APM
• Move Data Quality
• Move Exploratory View
• Move Infra <-- you are here
• Move Logs Explorer
• Move Logs Shared
• Move Observability AI Assistant
• Move Observability App
• Move Observability Onboarding
• Move Observability Shared
• Move Profiling
• Move Synthetics
• Move Uptime
• Move UX

[apmmachine]

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

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[elasticmachine]

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

[ryankeairns]

Moved scss file

[kibana-ci]

💛 Build succeeded, but was flaky

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• Commit: 231f98c
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Failed CI Steps

• Jest Tests #4
• FTR Configs #88

Test Failures

• [job] [logs] FTR Configs #88 / Alerting transform alert rule types transform_health rule runs correctly
• [job] [logs] Jest Tests #4 / Severity form field renders

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
infra	1.4MB	1.4MB	+11.0B

History

• 💚 Build #195389 succeeded 9cdaeb1
• 💛 Build #195383 was flaky 8143329
• 💚 Build #195255 succeeded 986ba16
• 💛 Build #195154 was flaky 9b3e3cc
• 💔 Build #195144 failed 9ed9e2a
• 💚 Build #195083 succeeded 16e1989

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@elasticmachine merge upstream