[AI Infra] Chat Experience: hide Observability and Elasticsearch AI Assistant side bar setting on serverless

[KodeRad]

Summary

Follow up to: #244532

This PR:

• Hides AI Assistant side bar setting when Chat Experience is set to Agent
  • for Elasticsearch Serverless
  • for Observability Serverless
• fixes the issue with AI Assistant button in nav bar on Elasticsearch serverless
  • it threw use_agent_builder_opt_in.ts:24 Uncaught TypeError: Cannot read properties of undefined (reading 'onechat') becasue onechat plugin was not available at the time

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Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
• Review the backport guidelines and apply applicable backport:* labels.

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Describe the risk, its severity, and mitigation for each identified risk. Invite stakeholders and evaluate how to proceed before merging.

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[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[elasticmachine]

Pinging @elastic/appex-ai-infra (Team:AI Infra)

[elasticmachine]

Pinging @elastic/obs-ai-team (Team:obs-ai)

[github-actions]

🤖 GitHub comments

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Just comment with:

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

[jennypavlova]

Obs presentation changes LGTM

[viduni94]

Thank you @KodeRad
LGTM

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: f6acb2d
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-246534-f6acb2d649fc

Failed CI Steps

• Jest Integration Tests #3
• FTR Configs #40
• Scout: [ platform / discover_enhanced ] plugin

Test Failures

• [job] [logs] Scout: [ platform / discover_enhanced ] plugin / dont show up if outside of range
• [job] [logs] Scout: [ platform / discover_enhanced ] plugin / serverless-es - Discover app - value suggestions: useTimeRange enabled - dont show up if outside of range
• [job] [logs] Jest Integration Tests #3 / Uprade package install version with package installed with a previous format install version should upgrade package install version for outdated packages

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
serverlessSearch	176	184	+8

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
observabilityAIAssistant	52.9KB	52.9KB	+43.0B
serverlessObservability	18.1KB	18.1KB	+2.0B
serverlessSearch	23.4KB	23.6KB	+261.0B
total			+306.0B

History

• 💔 Build #373795 failed dd5416e

cc @KodeRad