[DOCS-10679] Add blog and use cases to Reference Tables

[rtrieu]

What does this PR do? What is the motivation?

A customer passed along feedback that it wasn't clear what a reference table could be used for, so we added use cases and a blog that goes into detail about those use cases.

Merge instructions

Merge readiness:

• [ ] Ready for merge

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Additional notes

[github-actions[bot]]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/rtrieu/docs-10679-ref-table-use-cases/reference_tables/