feat(tasks) Add docs for external tasks

[markstory]

DESCRIBE YOUR PR

Adding docs for the taskbroker-client external namespace feature that was recently released.

Refs STREAM-610

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SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

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• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

[linear-code]

STREAM-610 Update sentry to use taskbroker_client

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ready	Preview, Comment	Mar 13, 2026 8:56pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
sentry-docs	Ignored		Mar 13, 2026 8:56pm