[SharedUX][Chrome Next] Add Spaces context switcher footer links

[angeles-mb]

Closes elastic/kibana-team#3410

Summary

Extracted from 6ad1bf9 from feature/chrome-next with modifications:

• Adds footer links to the Chrome Next context switcher based on environment (Serverless vs ECH) and user capabilities.

Footer links added:

• [Root] Get started (or Add data for Obs only): based on either project type (Serverless) or current solution (ECH), navigates to relevant get started page. Gated by the Kibana's navLinks capability.
• [Root] Connection details (Serverless): opens flyout, flyout content is internally gated, some flyout parts might not rendered based on Kibana's api_keys.save capability.
• [Root] Invite users: for Serverless it navigates to Cloud console users, gated by privileged URL internally based on hasManageSecurity gated by Kibana's users.save capability. For ECH it navigates to Kibana user management, gated by Kibana's users.save and navLinks capabilities.
• [Submenu] Create project/deployment: no Kibana-side permission check, gating TBD per [Vibranium][M2] Global Header: Context switcher Create Project/Deployment gating #267742

Testing

feature_flags.overrides:
  core.chrome.next: true

Root view	Submenu view

[kibanamachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: ab53a57
• Build duration: 65 mins

Failed CI Steps

• Jest Tests #4
• FTR Configs #172
• Scout Lane #13 - stateful-classic / default
• Scout Lane #41 - serverless-observability_complete / default

Test Failures

• [job] [logs] Jest Tests #4 / should remove the negated filter from filterManager
• [job] [logs] Scout Lane #41 - serverless-observability_complete / default / local-serverless-observability_complete - Traces in Discover - Explore from APM - Transaction Detail - "Open in Discover" links open traces experience
• [job] [logs] Scout Lane #13 - stateful-classic / default / local-stateful-classic - Ingest pipelines structure tree API - fetches a complex structure tree up to the fifth level

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
spaces	275	332	+57

Async chunks

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

id	before	after	diff
spaces	252.5KB	274.9KB	+22.3KB

Page load bundle

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

id	before	after	diff
cloud	10.3KB	10.4KB	+96.0B
spaces	26.8KB	26.8KB	+72.0B
total			+168.0B

History

• 💔 Build #450048 failed def1aa0
• 💔 Build #450038 failed eb879a8
• 💔 Build #450027 failed b8bf519

cc @angeles-mb

[infra-vault-gh-plugin-prod]

Pinging @elastic/appex-sharedux (Team:SharedUX)