Remove feature flag conditionals for serverless custom roles

[joepeeples]

Contributes to https://github.com/elastic/security-docs-internal/issues/11: post-release cleanup to remove the conditional DocIf syntax and alternate content.

Important

Do not merge until the custom user roles feature has been released to serverless production.

Previews

• Click the link in the comment below, then in the Security card click View serverless docs.
• Navigate to these pages, and confirm they display the correct information for custom roles in serverless:
  • Elastic Security requirements
  • Elastic Defend feature privileges
  • Configure network map data
  • Detections requirements
  • Entity risk scoring requirements
  • Cases requirements

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[joepeeples]

Custom roles feature has been released, and the respective feature flag enabled (https://github.com/elastic/docs-site/pull/41 merged). We can now remove the conditionals to clean up our code.

[nastasha-solomon]

LGTM!