What does this PR do?

Continues with #19125 to add support to Cloud Foundry consumer v1 API in Metricbeat too.

version can be used to select if v1 or v2 version should be used.

Why is it important?

We already support the v2 API, but we saw that this API is not reliable enough (see #18202 and #18282).

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

• Run metricbeat with the cloudfoundry input and check that it collects events. Try these combinations of the version option:
  • No version option (what would use v1)
  • version: v1.
  • version: v2.
  • For other values of version it should fail to start.

Related issues

• Continues with Add support for cloudfoundry logs collection using consumer v1 API #19125
• Relates [Meta] Cloud Foundry Support #16520
• Fixes Metricbeat : Cloudfoundry input dropping healthwatch metrics #18282