Updated template build documentation with new background build methods

[mintlify]

Added documentation for the new buildInBackground and getBuildStatus methods that allow users to start template builds without waiting for completion and check build status separately. This enables better control over build processes and non-blocking build workflows.

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Created by Mintlify agent

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Note

Adds docs for buildInBackground and getBuildStatus, restructures build page, and includes TS/Python examples with polling.

• Docs (docs/template/build.mdx):
  • Restructure build guide with sections: Build and wait for completion, Build in background, and Check build status.
  • New APIs documented: Template.buildInBackground and Template.getBuildStatus.
    • Provide JavaScript/TypeScript and Python examples.
    • Include background build workflow with status polling and log offset handling.
  • Enhance existing build examples to capture and describe returned buildInfo/build_info (template and build IDs).

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