[8.x] Add default ILM policies and switch to ILM for apm-data plugin (#115687)

[lahsivjar]

Backport

This will backport the following commits from main to 8.x:

• Add default ILM policies and switch to ILM for apm-data plugin (#115687)

Questions ?

Please refer to the Backport tool documentation

[dakrone]

@lahsivjar is this different than the version on main? (Normally backports do not need separate reviews, so I am curious whether it diverged)

[lahsivjar]

@dakrone Nothing changed from main however, the automated backport was not created so I created it manually (maybe that is why it is blocking merge without review?)

[dakrone]

maybe that is why it is blocking merge without review?

This is only for non-ES devs. We can handle merging this once it passes CI.

[axw]

@elasticmachine update branch