fix: changed GitPod References to Ona

VIJETA PRIYArequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:fix/6629-update-gitpod-references into main

Changed GitPod Flex references to Ona from CONTRIBUTING.md

Added Gitlab Docs link too (Ona Integration)

closes #6629 (closed)

Edited by VIJETA PRIYA

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