Cron: Make flushing response data and ignore_user_abort optional in wp-cron

[i-am-chitti]

Fixes https://core.trac.wordpress.org/ticket/65474

On some server configurations (notably LiteSpeed with LSPHP), calling litespeed_finish_request() or fastcgi_finish_request() can prematurely terminate the cron process mid-execution, causing data inconsistencies with plugins like WooCommerce and Action Scheduler.

This PR introduces two opt-out constants, definable in wp-config.php:

• WP_CRON_DISABLE_FLUSH — skips the fastcgi_finish_request() / litespeed_finish_request() call
• WP_CRON_DISABLE_IGNORE_ABORT — skips the ignore_user_abort(true) call

Both default to false, so no behavior change for existing sites. The naming follows existing WordPress conventions (DISABLE_WP_CRON, WP_DISABLE_FATAL_ERROR_HANDLER).

Note: The original patch on Trac proposed WP_CRON_FLUSH defaulting to false, which would have been a breaking change. This PR takes the opt-out approach instead.

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Props iamchitti, aldavigdis.

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[aldavigdis]

I request that this PR is closed until I make my own within a reasonable time frame, based on the original SVN patch at https://core.trac.wordpress.org/ticket/65474.

[i-am-chitti]

Closing based on https://core.trac.wordpress.org/ticket/65474#comment:9