[Fleet] Disable proxies feature in serverless

[nchaulet]

Summary

Disable proxies in serverless, in the UI settings and in the APIs.

UI Changes

Remove the proxy section

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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[juliaElastic]

LGTM

[azasypkin]

Changes in core_plugins/rendering.ts LGTM.

P.S. Off-topic, I'm curious why we use both enable- (xpack.fleet.agents.enabled, xpack.fleet.enableExperimental, any-plugin.enabled) and disable-naming convention (xpack.fleet.internal.disableProxies, pack.fleet.internal.disableILMPolicies) at the same time (we can pick either true or false as a default value if we need to) 🙂

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 20db103

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
fleet	973.3KB	973.5KB	+141.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	13	15	+2
securitySolution	416	420	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	497	501	+4
total			+6

History

• 💔 Build #137473 failed 05744b1

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

cc @nchaulet

[nchaulet]

P.S. Off-topic, I'm curious why we use both enable- (xpack.fleet.agents.enabled, xpack.fleet.enableExperimental, any-plugin.enabled) and disable-naming convention (xpack.fleet.internal.disableProxies, pack.fleet.internal.disableILMPolicies) at the same time (we can pick either true or false as a default value if we need to) 🙂

Yes I think we should probably harmonize that at some point, we are using disable* something for things where we want to opt-out that are enabled by default but it probably can be changed/fixed in the future.

[TinaHeiligers]

Changes to config/serverless.yml LGTM.