MM-56082 Add PreferencesHaveChanged plugin hook (#25659)

* Add interface for PreferencesHaveChanged hook

* Add context to preference-related methods of App

* Implement PreferencesHaveChanged

* Re-add missing "fmt" import

* Update minimum server version for the new hook

* Remove pointers to be consistent with other preference APIs

server/channels/web/oauth.go

@@ -159,7 +159,7 @@ func authorizeOAuthPage(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	isAuthorized := false
 
-	if _, err := c.App.GetPreferenceByCategoryAndNameForUser(c.AppContext.Session().UserId, model.PreferenceCategoryAuthorizedOAuthApp, authRequest.ClientId); err == nil {
+	if _, err := c.App.GetPreferenceByCategoryAndNameForUser(c.AppContext, c.AppContext.Session().UserId, model.PreferenceCategoryAuthorizedOAuthApp, authRequest.ClientId); err == nil {
 		// when we support scopes we should check if the scopes match
 		isAuthorized = true
 	}