[Ingest Manager] Copy default policy directly from an integration

[ruflin]

Today if running the standalone agent, the only way of getting a full config for an integration is creating a policy, add the integration and the copy the raw yaml. As most integrations have defaults for the config, we could make this easier.

A user looking at an integration, should also have an option to see the policy. One way of doing this could be to add an additional navigation on the left side (see below):

Hoping one day we show the integrations pages also on our website, the user then could even directly copy a policy from there. Having this public location for policies will also allow from discuss / github to link to it as examples.

In the future, we will probably have support for policy templates: #75853 It would be nice as soon as we support this, the users could also select which default policy to look at. As an example in the case of nginx, there would be a default policy for just running on a host and running on k8s.

All the above should not only be available in the UI, but also accessible through the API.

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)