Update Anthropic cost data latency to 24-48 hours

[xaviersicotte]

What does this PR do?

Updates the Anthropic Usage and Costs integration README to say cost data appears in Cloud Cost Management within 24-48 hours, instead of 24 hours.

Motivation

Fixes DOCS-15132

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[dd-octo-sts]

Validation Report

All 21 validations passed.

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