Remove old installation_creation_date metric

What does this MR do and why?

It removes the installation_creation_date metric. This metric was replaces with installation_creation_date_approximation 16.0 and now we want to remove the original metric.

How to set up and validate locally

1. On the master branch, start gdk rails console
2. Run

   payload = ServicePing::BuildPayload.new.execute; nil
   payload.has_key?("installation_creation_date")

   You should get true back.
3. Switch to the new branch. Run the have script again and see that you get false back.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #410164 (closed)