More documentation on Instrumentor's interaction with GET, Amp, and Switchboard

For issue gitlab-com/gl-infra/delivery#19557 (closed)

I cherry-picked in !635 (closed) commit in this MR since the information was overlapping.

This MR adds in:

• Change deployment workflow with ansible
  • Hoping this will give a detailed overview of how dedicated deploys ansible playbook resources. This is how dedicated deploys the GitLab helm chart and other resources that we're concerned about when we're talking about downtime.
  • I tried to add in as many examples of input and output of each tooling involved in the deployment process. Let me know if something is confusing or could use more explanation.
• Details about Instrumentor's interactions with Amp and GET
• Details about maintenance window (switchboard)
• Details about quality/testing (qa stage)
• Cleaned up delivery guide to dedicated to have a better flow when reading