[Security Solution][Detection engine] refactors lists legacy templates/ILM API calls in Serverless env.

[vitaliidm]

Summary

• moved deletion of legacy index template inside to migrateListIndexToDataStream and migrateListToDataStream. That would allow us not to rely on 410 error to tell if we are in Serverless environment and _template API is blocked. Migrate to DS function is called only in Stateful environment, as lists indices do not exist in Serverless
• deletion of legacy index template during migration has also other benefit: it will be called eventually for every instance of Kibana, and be more efficient then just calling it during index creation

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 7ac4628

Failed CI Steps

• Explore - Security Solution Cypress Tests #2
• Serverless Osquery Cypress Tests #2

Metrics [docs]

Unknown metric groups

API count

id	before	after	diff
lists	222	224	+2

History

• 💔 Build #153637 failed b80c6c5
• 💔 Build #153553 failed 762ac47

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @vitaliidm