DEV: fix a flakey spec in slugs_controller (#20350)

spec/integration/rate_limiting_spec.rb

@@ -44,6 +44,8 @@ RSpec.describe "rate limiter integration" do
       expect(response.cookies.has_key?(name)).to eq(true)
       expect(response.cookies[name]).to be_nil
     end
+
+    RateLimiter.clear_all!
   end
 
   it "can cleanly limit requests and sets a Retry-After header" do

spec/requests/slugs_controller_spec.rb

@@ -24,6 +24,7 @@ RSpec.describe SlugsController do
 
       it "rate limits" do
         RateLimiter.enable
+        RateLimiter.clear_all!
 
         stub_const(SlugsController, "MAX_SLUG_GENERATIONS_PER_MINUTE", 1) do
           post "/slugs.json?name=#{name}"