[workers-observability]: Add Query Builder Stream Video

[lauragift21]

Summary

Replace Query Builder Youtube embed with Stream video.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added a new video demonstration for the Query Builder feature in the Workers Observability documentation.

• Updated the Query Builder documentation to include a video demonstration.
• Replaced the YouTube embed with a Stream component for the demo video.

Modified Files

• src/content/docs/workers/observability/query-builder.mdx

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