Proposal for performance priority labels

Current description

To help clarify priority of issues, from the perspective of their impact on availability and performance of GitLab.com.

Closes https://gitlab.com/gitlab-com/infrastructure/issues/1943

Original description

I do not think this is a priority right now, but it stems from https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/5373/diffs which I broke into smaller merge requests.

data/applications.yml

@@ -50,6 +50,13 @@
       links:
         - url: http://branchesapp.co
           title: branchesapp.co
+    - title: Zulip
+      content: Get notifications about your GitLab projects in Zulip. Zulip is the world's most productive group chat and the leading open source alternative to Slack. With Zulip, you don't have to choose between missing important conversations and wasting time reading irrelevant ones.
+      links:
+        - url: https://zulipchat.com/
+          title: About Zulip
+        - url: https://zulipchat.com/integrations/#gitlab
+          title: Zulip's GitLab integration
 - title: CLI Clients
   id: cli-clients
   applications:
@@ -389,6 +396,11 @@
       links:
         - url: /features/gitlab-ci-cd/
           title: GitLab CI
+    - title: Bitrise
+      content: Hosted Continuous Integration and Delivery service for mobile apps. Craft powerful workflows to automate build, testing, deployment and feedback cycles to have more time for actual coding, while having constant overview about the state of your app.
+      links:
+        - url: https://www.bitrise.io
+          title: Bitrise.io
     - title: BuildKite
       content: BuildKite runs builds on GitLab commits, either on self-hosted GitLab repositories or GitLab.com.
       links:
@@ -433,7 +445,7 @@
         - url: https://www.buddybuild.com/blog/buddybuild-gitlab-integration
           title: buddybuild
     - title: Terraform
-      content: HashiCorp Terraform Enterprise provides integration with version control systems (VCS) to facilitate collaboration on infrastructure as code. 
+      content: HashiCorp Terraform Enterprise provides integration with version control systems (VCS) to facilitate collaboration on infrastructure as code.
       links:
         - url: https://www.hashicorp.com/blog/announcing-terraform-enterprise-integration-for-gitlab/
           title: Terraform