Remove guts of civicrm Mailing.preview

[eileenmcnaughton]

Overview

Remove guts of civicrm Mailing.preview

Before

civicrm_api3_mailing_preview is complex but unreachable

After

It is simple but unreachable

Technical Details

flexmailer interupts the api call. so the code in the api function is only called if flexmailer chooses to

Since 2022 flexmailer has not chose to as this statement has always returned FALSE

if (!Abdicator::isFlexmailPreferred($mailing) && empty($mailing->sms_provider_id)) {

because it is effectively

if (!empty($mailing->sms_provider_id) && empty($mailing->sms_provider_id)) {

Comments

I discovered this testing an SMS & realising it is never called. In addition to the 50 or so lines of code removed in this PR there are some hundreds of lines of code in functions it calls which are never reached as this is unreachable. Some of those are marked deprecated in this PR

[civibot]

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