Fix(sentry-server): Add Proguard artifact endpoint for Android builds

[alexsohn1126]

Fixes #99

Problem

In other integration test servers, they have endpoints for proguard-artifact-releases:

• https://github.com/getsentry/sentry-maven-plugin/blob/c2403b7113af5351d732308b24b2016dba0a4714/test/integration-test-server.py#L45
• https://github.com/getsentry/sentry-android-gradle-plugin/blob/5e15a33821ffe42aaa86a2a9311738f01a943820/test/integration-test-server.py#L45

This is causing getsentry/sentry-dotnet #4532 to fail.

Solution

Create an endpoint in sentry-server.py for proguard artifact upload

Test method

check out the branch alexsohn/fix/automatically-add-guid-for-proguard-upload from getsentry/sentry-dotnet.

Try to run the integration tests with main branch github-workflows, then you should see this:

After checking out this branch, you should see all the integration tests pass.