Pre-Production environments: Allow for more than 10 pre-production environments

**Is your feature request related to a problem? Please describe.**

We are a team with a few developers, trying to do our development work with a bunch of pull requests, and pull-request environments. Currently we have a few spikes that are waiting for feedback, and a number of ongoing work in other draft and open pull requests.

Today this meant that we had 10 open pull requests, and when a 11th was opened it could not be deployed as we only have 10 Pre-Production environments in the Azure SWA.

**Describe the solution you'd like**

I would like to be able to have more than 10 pre-production environments for a Azure Static Web App. I could pay more for this.

**Describe alternatives you've considered**

Changing to other similar hosting solutions, or rewriting our pull request environments to be folder based in instead of domain based.