…astic#176252)

## Summary

This is a part of
elastic/observability-docs#3622.

Before this PR, all four in-product APM alerting documentation links
pointed to
https://www.elastic.co/guide/en/kibana/master/apm-alerts.html. This PR
updates our in-product links to point to either our Serverless or
Stateful documentation, depending on the product type.

Closes elastic/observability-docs#3586.

---------

Co-authored-by: Kibana Machine <[email protected]>
Co-authored-by: Caue Marcondes <[email protected]>
(cherry picked from commit 62aa327)

…ss) (#176252) (#179093)

# Backport

This will backport the following commits from `main` to `8.13`:
- [Make in-product APM alerting links smart (stateful vs serverless)
(#176252)](#176252)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Kibana Machine
<[email protected]>\r\nCo-authored-by:
Caue Marcondes
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Co-authored-by: Brandon Morelli <[email protected]>