Adding AWS Cloud Cost Management Instructions for MSP Partners

[patrickywl]

What does this PR do? What is the motivation?

This PR introduces MSP-specific AWS Cloud Cost Management setup documentation under the Partners section.

For background and full context, see the following documents:

• https://datadoghq.atlassian.net/wiki/x/lACGPwE
• https://datadoghq.atlassian.net/wiki/x/BAGiPgE

Merge instructions

Merge readiness:

• [ ] Ready for merge

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Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/patrick.lee/aws_ccm_for_partners/partners/cloud_cost_management/
• https://docs-staging.datadoghq.com/patrick.lee/aws_ccm_for_partners/partners/cloud_cost_management/aws

[joepeeples]

Opened DOCS-12876 to assign a Docs writer and follow up with editorial review.