Remove deprecated SMSCommon.php

[colemanw]

Overview

Removes unused file we promised to remove by now.

Before

@deprecated since 5.71 will be removed around 5.77

After

Gone.

[civibot]

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[demeritcowboy]

Still referenced at

civicrm-core/CRM/Activity/Form/Task/SMS.php

Lines 48 to 54 in 7f43722

	if (CRM_Core_DAO::getFieldValue('CRM_Activity_DAO_Activity', $value, 'subject', 'id') != CRM_Contact_Form_Task_SMSCommon::RECIEVED_SMS_ACTIVITY_SUBJECT) {
	$activityCheck++;
	}
	}
	if ($activityCheck == count($this->_activityHolderIds)) {
	CRM_Core_Error::statusBounce(ts("The Reply SMS Could only be sent for activities with '%1' subject.",
	[1 => CRM_Contact_Form_Task_SMSCommon::RECIEVED_SMS_ACTIVITY_SUBJECT]

[eileenmcnaughton]

@colemanw this #31952 will resolve this PR

[eileenmcnaughton]

Should be OK now with the other merged

[colemanw]

Agree I no longer see any references to it.