Debug: Improve DISABLE_WP_CRON constant check in debug data

[rollybueno]

Adds proper handling of DISABLE_WP_CRON constant in WP_Debug_Data class, including translation support and debug value tracking. Feedback of https://core.trac.wordpress.org/ticket/63524#comment:9

Trac ticket: https://core.trac.wordpress.org/ticket/63524

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