[ska] Relocate functional services

[fake-haris]

Summary

Part of https://github.com/elastic/kibana-team/issues/1503

This PR relocates functional Services from x-pack/test/functional/apps/services dir to x-pack/platform/test/functional/apps/services.

Before:

/x-pack/test/functional/apps/services
     | - actions/
     | - aiops/
     | - cases/
     | - ml/
     | - monitoring/
     | - transform/
     | - rules/
     | - remote_es/
     | - canvas_element.ts

After:

/x-pack/platform/test/functional/apps/services
     | - actions/
     | - aiops/
     | - cases/
     | - ml/
     | - monitoring/
     | - transform/
     | - rules/
     | - rules/
     | - remote_es/
     | - canvas_element.ts

[elasticmachine]

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[dmlemeshko]

| - observability/

this is not a platform service, please keep it as it. I relocate in #226756

[elasticmachine]

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• 💔 Build #316338 failed 59b52b3
• 💔 Build #316218 failed 953d7ad

cc @fake-haris

[dmlemeshko]

It is a bit tricky with some of the services, you can wait for #226857 to be merged first as it moves ml, transform and few other services and updates references