Remove namespace requirement from Containers image

[gpanders]

Summary

Once cloudflare/workers-sdk#9813 is merged, users will not need to add their account ID namespace to the image name.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

Removed the requirement for users to include their account ID namespace in the Containers image name, simplifying the image management process.

• Eliminated the namespace requirement from the image name in the configuration.
• Updated documentation to reflect the new image naming convention.
• Clarified future plans for configuring public images directly in Wrangler.

Modified Files

• src/content/docs/containers/image-management.mdx

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[gpanders]

cc @mikenomitch