Adjust feature visibility based on Space solution

[legrego]

Blocked on:

• Add solution property to Spaces #183559
• [needs issue] A mapping of solution -> enabled features

Kibana should adjust the set of visible features within a space based on its configured solution.
This logic is only applicable for the stateful offering. Serverless projects do not respond to a space solution.

Requirements[solution=undefined | 'classic']

• No changes to behavior. Kibana should hide the disabledFeatures within the space.

Requirements[solution='security' | 'observability' | 'search']

• Kibana should hide all features which are not associated with this solution.
• Kibana should hide the disabledFeatures within the space. This is additive, in that it allows the space to have a subset of features available within the solution.

Notes

• The spaces plugin hides features using a "Capabilities Switcher":

  kibana/x-pack/plugins/spaces/server/capabilities/capabilities_switcher.ts

  Line 59 in 5e95a76

  function toggleDisabledFeatures(

• The spaces plugin also prevents direct access to applications via its on_post_auth_interceptor:

  kibana/x-pack/plugins/spaces/server/lib/request_interceptors/on_post_auth_interceptor.ts

  Lines 111 to 129 in 5e95a76

  	if (appId !== 'kibana' && space && space.disabledFeatures.length > 0) {
  	log.debug(`Verifying application is available: "${appId}"`);
  	const allFeatures = features.getKibanaFeatures();
  	const isRegisteredApp = allFeatures.some((feature) => feature.app.includes(appId));
  	if (isRegisteredApp) {
  	const enabledFeatures = allFeatures.filter(
  	(feature) => !space.disabledFeatures.includes(feature.id)
  	);
  	const isAvailableInSpace = enabledFeatures.some((feature) => feature.app.includes(appId));
  	if (!isAvailableInSpace) {
  	log.debug(`App ${appId} is not enabled within space "${spaceId}".`);
  	return response.notFound();
  	}
  	}
  	}

• Functional tests for UI capabilities are located in x-pack/test/ui_capabilities

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)