[MM-56073] MMCTL delete post command (#27539)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/public/model/client4.go

@@ -4021,6 +4021,16 @@ func (c *Client4) DeletePost(ctx context.Context, postId string) (*Response, err
 	return BuildResponse(r), nil
 }
 
+// PermanentDeletePost permanently deletes a post and its files from the provided post id string.
+func (c *Client4) PermanentDeletePost(ctx context.Context, postId string) (*Response, error) {
+	r, err := c.DoAPIDelete(ctx, c.postRoute(postId)+"?permanent="+c.boolString(true))
+	if err != nil {
+		return BuildResponse(r), err
+	}
+	defer closeBody(r)
+	return BuildResponse(r), nil
+}
+
 // GetPostThread gets a post with all the other posts in the same thread.
 func (c *Client4) GetPostThread(ctx context.Context, postId string, etag string, collapsedThreads bool) (*PostList, *Response, error) {
 	url := c.postRoute(postId) + "/thread"

server/public/model/config.go

@@ -387,6 +387,7 @@ type ServiceSettings struct {
 	EnableAPITeamDeletion                             *bool
 	EnableAPITriggerAdminNotifications                *bool
 	EnableAPIUserDeletion                             *bool
+	EnableAPIPostDeletion                             *bool
 	EnableDesktopLandingPage                          *bool
 	ExperimentalEnableHardenedMode                    *bool `access:"experimental_features"`
 	ExperimentalStrictCSRFEnforcement                 *bool `access:"experimental_features,write_restrictable,cloud_restrictable"`
@@ -806,6 +807,10 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 		s.EnableAPIUserDeletion = NewPointer(false)
 	}
 
+	if s.EnableAPIPostDeletion == nil {
+		s.EnableAPIPostDeletion = NewBool(false)
+	}
+
 	if s.EnableAPIChannelDeletion == nil {
 		s.EnableAPIChannelDeletion = NewPointer(false)
 	}