[Queues] Add a changelog entry and examples for the new HTTP Push API

[sdnts]

Summary

Adds a changelog entry for a new way to push to a Queue via HTTP. We also had an example that showed users how to fake it through a Worker. I've simplified that example, and added a new one for the real thing.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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 changelog entries and examples for the new HTTP Push API for Queues.

• Introduced a new example for publishing to a Queue via HTTP.
• Simplified the existing example for publishing to a Queue via Workers.
• Updated documentation to include prerequisites and usage instructions for both methods.

Added Files

• src/content/docs/queues/examples/publish-to-a-queue-via-http.mdx
• src/content/docs/queues/examples/publish-to-a-queue-via-workers.mdx

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