VPN-7467 Create non-playstore release

[encrypt94]

Description

Create a release variant that does not rely on Google Play Services (GPS), allowing the app to be published on GitHub and our website so users with devices that do not support GPS can install and use the VPN.

Currently, we rely on Google Play Services only for in-app purchases. This PR updates the build scripts to generate two separate app flavors:

• playstore with IAP enabled
• website with web purchase enabled

Note: marked as a draft as we need AndroidAuthenticationListener from #11036 for this to work properly

Reference

Jira Issue

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed