Logging: Delete UI code for configuring logging via Elastic Stack

Why are we doing this work

In %15.0, we disabled/removed pod logs by moving it behind a feature flag.

⚠ Removal should take place in %15.2 or later.

Tracking issue for all logging removal work: Monitor:Logging Deprecation (#346485 - closed)

Relevant links

frontend files:

• app/views/clusters/clusters/\_integrations.html.haml
• app/views/clusters/clusters/\_namespace.html.haml [string change]

documentation files:

• https://docs.gitlab.com/ee/user/clusters/integrations.html#elastic-stack-cluster-integration
• https://docs.gitlab.com/ee/user/clusters/applications#install-elastic-stack-using-gitlab-cicd

Implementation plan

• delete setting to enable elastic stack from Infrastructure > Kubernetes clusters > cluster > Integrations
• delete relevant docs

Note: global search is not related.

Verification

This is the area of the app which should remain without regressions to other features & the elastic stack option should remain unavailable: