[Obs AI Assistant] Use preconfigured Elser inference endpoint

[sorenlouv]

Closes #200908

In #186499 semantic text was added to the internal knowledge base. This uses our own inference endpoint (obs_ai_assistant_kb_inference) which must be setup before the knowledge base is available.

In 8.17 Elasticsearch ships with preconfigured elser and e5 inference endpoints (PR), meaning we don't have to have our own. This PR removes everything related to handling and validating the inference pipeline and the underlying model, since we can assume this is provided by the platform

[elasticmachine]

Pinging @elastic/obs-ai-assistant (Team:Obs AI Assistant)

[github-actions]

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[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: e1d81e7
• Storybooks Preview
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-201108-e1d81e74eee2

Failed CI Steps

• FTR Configs #7
• FTR Configs #7
• FTR Configs #38
• FTR Configs #38

Test Failures

• [job] [logs] FTR Configs #7 / management Index patterns on aliases discover verify hits should be able to discover and verify no of hits for alias2
• [job] [logs] FTR Configs #7 / management Index patterns on aliases discover verify hits should be able to discover and verify no of hits for alias2
• [job] [logs] FTR Configs #38 / Observability AI Assistant Serverless API tests complete/complete.spec.ts /internal/observability_ai_assistant/chat/complete returns a streaming response from the server
• [job] [logs] FTR Configs #38 / Observability AI Assistant Serverless API tests complete/complete.spec.ts /internal/observability_ai_assistant/chat/complete returns a streaming response from the server

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observabilityAIAssistantApp	379	377	-2
observabilityAiAssistantManagement	367	365	-2
searchAssistant	241	239	-2
total			-6

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/ai-assistant	64	60	-4

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
observabilityAIAssistantApp	237.5KB	230.0KB	-7.5KB
observabilityAiAssistantManagement	97.7KB	97.0KB	-771.0B
searchAssistant	160.2KB	152.9KB	-7.3KB
total			-15.6KB

Unknown metric groups

API count

id	before	after	diff
@kbn/ai-assistant	64	60	-4

History

• 💔 Build #254468 failed 41cd91e
• 💔 Build #254372 failed 4c8c774
• 💔 Build #253393 failed 2f56df0
• 💔 Build #253169 failed 13a7b62

[elasticmachine]

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