[Onepane] Adds Onepane Integration

[sajosam]

What does this PR do?

This PR adds documentation for the Onepane integration, including an overview, setup instructions, uninstallation steps, and information about data collected

Motivation

The motivation is to provide users with clear instructions on how to connect Datadog to Onepane, enabling them to leverage additional value from their existing Datadog investments. This integration allows users to correlate incidents with change data and infrastructure data, potentially improving root cause analysis and incident resolution

Review checklist

• [x] PR has a meaningful title or PR has the no-changelog label attached
• [x] Feature or bugfix has tests
• [x] Git history is clean
• [x] If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• [ ] If this PR includes a log pipeline, please add a description describing the remappers and processors.

Additional Notes

Anything else we should know when reviewing?

[drichards-87]

Created Jira card for Docs Team editorial review.

[eho1307]

Thanks for opening this PR! Dominic has reached out over email for additional information before we proceed with reviews.