Allow duplication on all post statuses

[mikeyarce]

Fixes https://github.com/Automattic/WP-Job-Manager/issues/2470

Changes Proposed in this Pull Request

• Adds a filter job_manager_allowed_post_status_duplicate_jobs that will allow people to filter which post status will be allowed to duplicate jobs in the Job Dashboard
• Default is to allow just ‘publish’ status, which won’t change any behaviours.

Testing Instructions

• Apply this PR
• Add a filter like this to your site:

add_filter( 'job_manager_allowed_post_status_duplicate_jobs', function( $post_status ) {
    $post_status[] = 'preview';
    return $post_status;
});

• Make sure you have a "draft" job in your job dashboard
• Ensure that you can now duplicate it!

Release Notes

• New filter, job_manager_allowed_post_status_duplicate_jobs will let you set specific post statuses that will have the duplicate optionin the Job Dashboard.

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Plugin build for 82286ded26febb5ba3b64e21f0b29c11b10cccbc
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[mikeyarce]

@yscik I was leaning that way originally, so now that you say that I think we should do it for all post statuses. Done in https://github.com/Automattic/WP-Job-Manager/pull/2780/commits/82286ded26febb5ba3b64e21f0b29c11b10cccbc