Persist excluded recipients when saving mail

Summary:
Fixes T5185. The fundamental issue is that this `excludePHIDs` property was not saved, so the logic went like this:

  - Generate `excludePHIDs` correctly.
  - Pass `excludePHIDs` through the stack.
  - Perform some other computations correctly.
  - Queue the mail for the daemons, throwing it away. {icon bomb}
  - Daemons process mail with empty `excludePHIDs` list.

Store it in the persistent properties array instead.

Also remove the "override self mail" thing, since it's only used by `bin/mail send-test` and suffers from the same issue. I think it's too useless to fix, since even if you get caught by it, `bin/mail` makes it clear why the message was dropped.

Test Plan:
Notable:

  - `exclude` present in properties
  - Exclusion reason under RECIPIENTS header

{P1229}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5185

Differential Revision: https://secure.phabricator.com/D10234

src/applications/metamta/management/PhabricatorMailManagementSendTestWorkflow.php

@@ -117,7 +117,6 @@ final class PhabricatorMailManagementSendTestWorkflow
       ->addCCs($ccs)
       ->setSubject($subject)
       ->setBody($body)
-      ->setOverrideNoSelfMailPreference(true)
       ->setIsHTML($is_html)
       ->setIsBulk($is_bulk)
       ->setMailTags($tags);

src/applications/metamta/storage/PhabricatorMetaMTAMail.php

@@ -17,8 +17,6 @@ final class PhabricatorMetaMTAMail extends PhabricatorMetaMTADAO {
   protected $message;
   protected $relatedPHID;
 
-  private $excludePHIDs = array();
-  private $overrideNoSelfMail = false;
   private $recipientExpansionMap;
 
   public function __construct() {
@@ -115,21 +113,13 @@ final class PhabricatorMetaMTAMail extends PhabricatorMetaMTADAO {
     return $this;
   }
 
-  public function setExcludeMailRecipientPHIDs($exclude) {
-    $this->excludePHIDs = $exclude;
+  public function setExcludeMailRecipientPHIDs(array $exclude) {
+    $this->setParam('exclude', $exclude);
     return $this;
   }
+
   private function getExcludeMailRecipientPHIDs() {
-    return $this->excludePHIDs;
-  }
-
-  public function getOverrideNoSelfMailPreference() {
-    return $this->overrideNoSelfMail;
-  }
-
-  public function setOverrideNoSelfMailPreference($override) {
-    $this->overrideNoSelfMail = $override;
-    return $this;
+    return $this->getParam('exclude', array());
   }
 
   public function getTranslation(array $objects) {
@@ -828,7 +818,7 @@ final class PhabricatorMetaMTAMail extends PhabricatorMetaMTADAO {
         ->withPHIDs(array($from_phid))
         ->execute();
       $from_user = head($from_user);
-      if ($from_user && !$this->getOverrideNoSelfMailPreference()) {
+      if ($from_user) {
         $pref_key = PhabricatorUserPreferences::PREFERENCE_NO_SELF_MAIL;
         $exclude_self = $from_user
           ->loadPreferences()