[enterprise-4.16] OBSDOCS-933: Add documentation for forward connector

[openshift-cherrypick-robot]

This is an automated cherry-pick of #75070

/assign skopacz1

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OBSDOCS-933

In response to this:

This is an automated cherry-pick of #75070

/assign skopacz1

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[ocpdocs-previewbot]

🤖 Wed Jun 05 14:03:28 - Prow CI generated the docs preview:

https://76956--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/otel/otel-configuration-of-otel-collector.html

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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