[DOCS-14257] Add Pipeline Simulation doc

[maycmlee]

What does this PR do? What is the motivation?

• Adds Pipeline Simulation doc
• Adds six images and two MP4s
• Adds nav item
• Updates Set Up Pipelines

Merge instructions

Merge readiness:

• Ready for merge

For Datadog employees:

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If your branch doesn't follow this format, rename it or create a new branch and PR.

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AI assistance

Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/may/op-pipeline-simulation/observability_pipelines/configuration/pipeline_simulation

Modified Files

• https://docs-staging.datadoghq.com/may/op-pipeline-simulation/observability_pipelines/configuration/set_up_pipelines

[datadog-datadog-prod-us1]

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 1 Pipeline job failed

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