[PR #2775/c9cf6411 backport][stable-3] datadog_event : Adding api_host as an optional parameter

[patchback]

This is a backport of PR #2775 as merged into main (c9cf641).

SUMMARY

Users need the ability to define an API endpoint for the datadog_event Ansible module to send data to. By default, it sends to api.datadog.com which is not necessarily always the case.
This change is to add an optional api_host parameter to pass to the module in order for the events to reach the right location.

This is related to issue #2774

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

datadog_event

ADDITIONAL INFORMATION

The change mainly targets plugins/modules/monitoring/datadog/datadog_event.py to allow users to define datadog api_host in their playbooks

As a result of this change, the playbook now would accept api_host as an optional parameter for datadog_event module where it takes a string value. Example playbook after this change:

---
- name: Test
  hosts: localhost
  tasks:
  - name: datadog_test
    community.general.datadog_event:
      title: Test
      text: This is just a test
      priority: low
      tags: '#group:heros'
      # The URL is for demonstration purposes
      api_host: 'Avengers.datadoghq.eu'
      api_key: KEY
      app_key: KEY