[DOCS-13601] Add SDS best practices section

[maycmlee]

What does this PR do? What is the motivation?

• Adds a best practices section to Sensitive Data Scanner processor.
• Adds a section on how to delete a rule.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/may/sds-best-practices/observability_pipelines/processors/sensitive_data_scanner

[brett0000FF]

Looks good! Just left a few tiny suggestions.