update to use /api/{projectId}/store

The default recommended rate limiting on the sentry
    documentation rate limits by `projectId`.

It's a better default to talk to a sentry server using the
    `/api/{projectId}/store` API.

This way multiple services talking to the same sentry
    server will not all get rate limited under the same
    projectId (which is presumably the empty string).
Why removing the coffee test run?