[Logs UI] Make URL syncing optional in the Log View state machine

[Kerry350]

Summary

This fixes #154030 (and other uses of the Log Stream embeddable component).

The embeddable component calls useLogView() directly, and this causes issues with context dependencies for URL syncing from the consumers.

This PR makes the URL actions / services optional within the machine.

Uses:

• <LogViewProvider /> used for all main Logs pages (stream, anomalies, categories) has full URL syncing ✅
• <LogViewProvider /> used within our Logs alert editor does not have URL syncing (not needed) ❌
• useLogView() as used by the embeddable component does not have URL syncing ❌
• useLogView() as used by RedirectToNodeLogs does not have URL syncing (not needed, URL syncing kicks in after redirect) ❌

The default / pure implementation of initializeFromUrl just does a send({ type: 'INITIALIZED_FROM_URL', logViewReference: null }) as the state machine needs to transition to it's initialized state and is already set up to use the initial context reference if there's no reference obtained from the URL.

Examples:

[apmmachine]

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[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: f2fa887

Failed CI Steps

• FTR Configs #21
• FTR Configs #59

Test Failures

• [job] [logs] FTR Configs #21 / dashboard Reporting Dashboard Reporting Screenshots Sample data from Kibana 7.6 PNG file matches the baseline image
• [job] [logs] FTR Configs #59 / maps app maps loaded from sample data ecommerce "before all" hook for "should load layers"

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	+522.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
securitySolution	432	435	+3

Total ESLint disabled count

id	before	after	diff
securitySolution	512	515	+3

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

cc @Kerry350

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[tonyghiani]

LGTM, thanks for the quick fix 👏