Add pipelined Redis commands to performance bar

What does this MR do and why?

This also includes them in redis_calls, redis_duration_s, and other related fields in the logs.

Related to gitlab-com/gl-infra/scalability#1846 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. Visit a project's page (http://127.0.0.1:3000/flightjs/Flight)

2. In the Redis section of the performance bar, you should see:

   

For easier testing, I also tried something like this:

diff --git a/app/controllers/dashboard/todos_controller.rb b/app/controllers/dashboard/todos_controller.rb
index d2434d4b0ba..0b8ebb13922 100644
--- a/app/controllers/dashboard/todos_controller.rb
+++ b/app/controllers/dashboard/todos_controller.rb
@@ -12,6 +12,9 @@ class Dashboard::TodosController < Dashboard::ApplicationController
   urgency :low

   def index
+    Gitlab::Redis::Cache.with { |r| r.pipelined { |rr| rr.get('key1'); rr.get('key2'); } }
+    Gitlab::Redis::Cache.with { |r| r.multi { |rr| rr.set('key1', 'test'); rr.set('key2', 'test'); } }
+
     @sort = params[:sort]
     @todos = @todos.page(params[:page])
     @todos = @todos.with_entity_associations

Just to force a URL to do some pipelined calls.

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