[CPS] Support in Discover

[mbondyra]

Summary

Adds CPS functionality to Discover, enabling saved searches and Discover embeddables to react to changes in CPS project picker.

Discover app

1. When going to Discover, project routing is set to default spaces setting (for now hardcoded).
2. When moving to another app or reloading Discover page, the setting is reset.
3. Project routing is not persisted in URL.
4. The user has the ability to save the project routing setting to a Discover session. If it's saved, next time it will be loaded with the saved setting.
5. Project routing is persisted per discover session if the user choses to save it to saved object, not per tab (with the ability to override for ESQL tabs)

Dashboard

1. By default, Discover session takes the CPS setting from the Dashboard (implemented here)
2. If Discover session has its own project routing saved in, it takes precedence over the Dashboard setting and informs the user about scope overrides via custom badge (please do not pay much attention to the badge current design, it will be refined later on + it doesn't display yet for ESQL cases):

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[nreese]

Any way to make the CPS override badge in the panel header smaller and look more like CPS picker button from unified search?

[mbondyra]

Any way to make the CPS override badge in the panel header smaller and look more like CPS picker button from unified search?

You mean the icon? It has to be added to EUI, we're working on it. The design is not final yet - we'll be refining in the next PR 🙏🏼

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 0cd8699

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
discover	1862	1863	+1
presentationPanel	159	160	+1
total			+2

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
discover	157	158	+1
savedSearch	102	103	+1
total			+2

Async chunks

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

id	before	after	diff
aiops	526.6KB	526.8KB	+172.0B
dataVisualizer	597.5KB	597.6KB	+170.0B
discover	1.3MB	1.3MB	+2.7KB
embeddableAlertsTable	1001.0KB	1001.2KB	+173.0B
lens	1.6MB	1.6MB	+178.0B
maps	3.1MB	3.1MB	+179.0B
ml	5.6MB	5.6MB	+344.0B
presentationPanel	40.7KB	43.0KB	+2.3KB
savedSearch	6.9KB	7.1KB	+216.0B
slo	991.7KB	991.9KB	+172.0B
synthetics	1.0MB	1.0MB	+172.0B
visualizations	343.5KB	343.7KB	+172.0B
total			+6.9KB

Page load bundle

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

id	before	after	diff
presentationPanel	10.1KB	10.3KB	+198.0B
savedSearch	10.1KB	10.3KB	+113.0B
total			+311.0B

Unknown metric groups

API count

id	before	after	diff
discover	199	200	+1
savedSearch	106	107	+1
total			+2

History

• 💔 Build #368672 failed 3a872d2
• 💔 Build #368491 failed fee1244
• 💔 Build #368338 failed c87efbe
• 💔 Build #368206 failed a8ccd3a