[Meta] Prepare Ingest UIs for new platform

[monicasarbu]

This GitHub issue outlines the necessary work to migrate to the new platform.

The Ingest team is responsable for the following UIs:

• Stack Monitoring UI
  Owner: Stack Monitoring team (@chrisronline & @igoristic)
  Audit owner: @chrisronline
  Effort: hard
  GitHub issue: [Meta] Prepare stack monitoring for new platform #33671

• Logstash Central Management
  Part of Management -> Logstash -> Pipelines
  Owner: Beats team: @jen-huang
  Audit owner: @jen-huang
  Effort: easy
  Github issue: [META] Prepare Logstash Central Management for new platform #55501

• Grok debugger
  Part of DevTools -> Grok debugger
  Owner: Beats team: @jen-huang
  Audit owner: @jen-huang
  Effort: easy
  Github issue: [META] Prepare Grok Debugger for new platform #49773

• Beats Central Management
  Part of Management -> Beats
  Owner: Beats team
  Audit owner: @mattapperson
  Effort: Easy (but has a number of blockers)
  Github Issue: [Meta] Prepare BeatsCM for new platform #47364
  NOTE: No need to migrate to the new Kibana platform as Beats Central Management will be removed by 8.0

• Fleet
  Owner: Beats team @jen-huang
  Audit owner: @mattapperson
  Effort: Easy

Effort options: complete rewrite / hard / easy

@jsvd @urso @cachedout @restrry

[elasticmachine]

Pinging @elastic/beats (Team:Beats)

[elasticmachine]

Pinging @elastic/stack-monitoring (Team:Monitoring)

[jen-huang]

Closing this meta issue as this isn't super useful with the recent org changes. The linked issues will remain open, and are linked to from Platform team's tracking sheet.