Remove license checks from ES UI Basic-licensed plugins

[cjcenizal]

Per #95973 (review), many of ES UI's Basic-licensed apps implement an unnecessary server-side license check. See for example: Ingest Node Pipelines, Index Management and ILM). We can remove these since Basic-licensed apps will be unrestricted under any license.

• Ingest node pipelines (Remove license check from Ingest Node Pipelines UI #100189)
• Index Management (Remove license check from Index Management #100188)
• ILM
• Painless Lab
• Remote clusters
• Rollup
• Snapshot and Restore

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[cjcenizal]

I'm working through ILM and I just found out that it does its own fetching of snapshot policies and snapshot repositories, which are available under the Enterprise license. These entities are used to power the searchable snapshots and "Wait for snapshot before deleting" functionality, respectively.

I wonder if we should create an optional dependency upon the Snapshot and Restore plugin and use its APIs to fetch these entities instead?

Pros	Cons
Single source of truth for fetching SR entities	Theoretically, a user might disable the SR plugin in Kibana without disabling it in ES, creating a false dependency
Reduced code
We can disable the relevant UI if the plugin is disabled

This boils down to the essential question: is it fair and realistic to assume the ES SR functionality is available if the Snapshot and Restore plugin is enabled? FWIW, this plugin is enabled in Cloud, despite Cloud having its own backups UI.