db export: Avoid exec() in option probe

[scribu]

As described in #283, if the host disables the exec() function, db export will fail silently with exit code 255.

This works around that that by using Utils\proc_open_compat().

[github-actions]

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[gemini-code-assist]

Code Review

This pull request introduces a test case for database exports when PHP's exec() function is disabled and replaces direct exec() calls with a new command_supports_option method. Feedback suggests refactoring this new method to use WP_CLI\Process to mitigate potential deadlock risks and remove unnecessary STDIN usage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[swissspidy]

What a lovely surprise to see you here! Thanks for your contribution :)

[scribu]

Heya :) No problem, thanks for the quick merge!