Fix #2747: open/reopen container tabs in tab groups when appropriate

Firefox 137 introduced tab groups. Tab group web extension support is rolling out in Firefox 138 and later. Creating a new tab after the last tab in a tab group can inadvertently create the new tab outside of the tab group.

When a user opens a new tab that should be in a container, this patch will make sure that the new tab resides in the same tab group as the original tab.

src/js/background/messageHandler.js

@@ -91,7 +91,9 @@ const messageHandler = {
           m.newUserContextId,
           m.tabIndex,
           m.active,
-          true
+          true,
+          null,
+          m.groupId
         );
         break;
       case "assignAndReloadInContainer":
@@ -101,7 +103,9 @@ const messageHandler = {
           m.newUserContextId,
           m.tabIndex,
           m.active,
-          true
+          true,
+          null,
+          m.groupId
         );
         // m.tabId is used for where to place the in content message
         // m.url is the assignment to be removed/added