[Logs onboarding] Add service name to logs setup

[yngrdyn]

Closes #159492.

This PR adds a field to logs setup so users can define optionally the service name of the service generating logs.

Changes

• New input for serviceName in setup step.
• ServiceName is added to SO.
• ServiceName is used in generateYml.

Demo

Untitled.mp4

[apmmachine]

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[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 3209b10

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
observabilityOnboarding	44.6KB	45.3KB	+752.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
securitySolution	410	414	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
securitySolution	491	495	+4
total			+6

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@elasticmachine merge upstream

[sorenlouv]

So great to have this in from day one of the new onboarding flow!