Be able to run relay integration tests with the test docker setup

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The test docker setup for Sentry development is documented in https://develop.sentry.dev/testing/#getting-setup

Posted here for posterity:

# Turn off services for local testing.
sentry devservices down

# Turn on services with a test prefix to use separate containers and volumes
sentry devservices up --project test

# Verify that test containers came up correctly
docker ps --format '{{.Names}}'

# Later when you're done running tests and want to run local servers again
sentry devservices down --project test && sentry devservices up

This docker setup is incompatible with relay integration tests when running this locally:

pytest -vv tests/relay_integration/tests.py

The relay setup assumes there is a sentry network, and will attempt to connect to docker containers brought up with sentry devservices up (e.g. sentry_kafka).

We should expect to be able to run relay integration tests that is agnostic to how docker containers are setup.

[github-actions[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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