fix(cli publish): fix namespace resolution and add Content-Type header

[amirabbas-gh]

📚 Description

This PR addresses two improvements to the codemod publishing flow:

• Fix: Corrects the way namespace is received and handled in the publish route. Previously, the namespace could be incorrectly extracted or missing, causing publishing issues.
• Feat: Adds a Content-Type: application/json header for publish requests made from the CLI. This ensures better consistency with API expectations and improves reliability when handling request payloads.

These changes improve the stability and correctness of the publishing mechanism for codemods.

🧪 Test Plan

• Verified publishing a codemod from the CLI with the updated header and confirmed a successful publish.
• Tested scenarios with and without explicit namespace values to ensure correct behavior.

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
codemod	⬜️ Ignored (Inspect)	Visit Preview		Apr 28, 2025 3:18pm

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npm i https://pkg.pr.new/codemod@1521

commit: d80538c