feat: always ignore user abort

[AlliBalliBaba]

Automatically sets ignore_user_abort to true in worker mode as mentioned in #2186, removing the requirement to change it via ini.

Would also be possible to expose something like an explicit frankenphp_client_has_closed() function for in-between critical sections.

[AlliBalliBaba]

Looks like containerimage.config.digest is sometimes empty, not sure what has changed, maybe something in upstream images.

[Copilot]

Pull request overview

This PR automatically enables ignore_user_abort for worker threads, eliminating the need for users to manually configure this setting via INI or in their worker scripts.

Changes:

• Automatically sets ignore_user_abort to true for worker threads and restores the original setting for non-worker threads
• Adds a test to verify workers continue execution after connection abort
• Removes documentation instructing users to manually call ignore_user_abort(true)

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
frankenphp.c	Stores original ignore_user_abort setting and automatically enables it for worker threads
worker_test.go	Adds test case verifying worker continues after client connection abort
docs/worker.md	Removes manual ignore_user_abort(true) call from documentation

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