Merge branch '7.4' into 8.0

* 7.4:
  Fix generating logout link with stateless csrf
  [AssetMapper] Fix tests
  [Notifier] Add support for `confirm` option in Slack buttons API
  [DebugBundle] Wire `DumpDataCollector`'s `webMode` argument
  filter should be empty when filtering on all domains
  [Routing] Initialize `router.request_context`'s `_locale` parameter to `%kernel.default_locale%`

Author: nicolas-grekas

Resources/config/services.php

@@ -52,6 +52,7 @@
                 param('kernel.charset'),
                 service('.virtual_request_stack'),
                 null, // var_dumper.cli_dumper or var_dumper.server_connection when debug.dump_destination is set
+                param('kernel.runtime_mode.web'),
             ])
             ->tag('data_collector', [
                 'id' => 'dump',