'two-browser' tag separates out tests that run multiple browsers in pipeline so that --parallel tests don't interfere w. loading of one or more of such windows; both FTs.test_sharing & woodpecker.yaml updated accordingly

src/functional_tests/test_sharing.py

@@ -1,6 +1,7 @@
 import os
 
 from django.conf import settings
+from django.test import tag
 from selenium import webdriver
 from selenium.webdriver.common.by import By
 
@@ -19,6 +20,7 @@ def quit_if_possible(browser):
 
 # Test mdls
 class SharingTest(FunctionalTest):
+    @tag("two-browser")
     def test_can_share_a_note_with_another_user(self):
         self.create_pre_authenticated_session("disco@test.io")
         disco_browser = self.browser