[TIP] Remove feature flag for Threat Intelligence plugin

[PhilippeOberti]

Summary

The Threat Intelligence plugin has been hidden behind a feature flag since early August (ticket and PR).

We are now ready to go GA for 8.5 release! This current PR removes the threatIntelligenceEnabled feature flag from the Security Solution plugin. This solves only the first AC of this going GA ticket.

Notes:

• this other PR modifies the Threat Intelligence README file. It might not be necessary anymore after the feature flag is removed
• depending on the decision made in this other PR, we might need to go update the development-setup.mdx file in the security-team repo.

Checklist

• [x] Unit or functional tests were updated or added to match the most common scenarios

[PhilippeOberti]

Files by Code Owner

elastic/protections-experience

• x-pack/plugins/security_solution/public/threat_intelligence/links.ts
• x-pack/plugins/security_solution/public/threat_intelligence/routes.tsx
• x-pack/test/threat_intelligence_cypress/config.ts

elastic/security-engineering-productivity

• x-pack/test/security_solution_cypress/config.ts

elastic/security-solution

• x-pack/plugins/security_solution/common/experimental_features.ts
• x-pack/plugins/security_solution/public/common/components/navigation/use_security_solution_navigation/index.tsx
• x-pack/plugins/security_solution/public/threat_intelligence/links.ts
• x-pack/plugins/security_solution/public/threat_intelligence/routes.tsx

elastic/security-threat-hunting-explore

• x-pack/plugins/security_solution/public/common/components/navigation/use_security_solution_navigation/index.tsx

[kibana-ci]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: 95f89d2286f0400abc2206276defe8593248d7f4

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
securitySolution	6.6MB	6.6MB	-213.0B

Page load bundle

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

id	before	after	diff
securitySolution	263.2KB	263.2KB	-29.0B

History

• :green_heart: Build #75382 succeeded 02f0245dcbe99699c949765bcf27ff2df15a3214
• :green_heart: Build #74014 succeeded 71e0a8d37e155c41da2b27b29a08e07e29fdfec4

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

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.5

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)