[Security Solution][Onboarding] Replace Getting Started in ESS/Stateful with Serverless Security Hub

[angorayc]

https://github.com/elastic/security-team/issues/8239

This issue is to replace Getting Started in ESS/Stateful with Serverless Security Hub

Implementation details: Move the get_started component from security_solution_serverless plugin to security_solution plugin, so we can share the same UI between two versions.

Parameters are set via x-pack/plugins/security_solution/public/contract_get_started_page.ts, so security_solution_serverless and security_solution_ess can set individual configs.

Implementation: https://github.com/elastic/kibana/pull/174867

Next Steps:

• [ ] https://github.com/elastic/kibana/pull/175296
• [ ] #175666
• [x] #175665
• [ ] #175689
• [x] #175697
• [x] https://github.com/elastic/kibana/issues/174766
• [ ] https://github.com/elastic/kibana/issues/175000
• [x] #179642

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)

[elasticmachine]

Pinging @elastic/security-threat-hunting-explore (Team:Threat Hunting:Explore)

[angorayc]

https://github.com/elastic/kibana/pull/174867