Remove runtox.sh

[antonpirker]

The functionality of runtox.sh can be also done with tox -f so I will remove the shell script to simplify things.

[codecov]

❌ 449 Tests Failed:

Tests completed	Failed	Passed	Skipped
29430	449	28981	5316

View the top 3 failed tests by shortest run time

 tests.integrations.arq.test_arq

Stack Traces | 0s run time

No failure message available

 tests.integrations.grpc.test_grpc

Stack Traces | 0s run time

No failure message available

 tests.integrations.starlette.test_starlette

Stack Traces | 0s run time

No failure message available

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[antonpirker]

There is one problem with this: We group different frameworks together in one YAML file (like all database integrations) and those integrations need different Python versions to test on. The YAML has specified a union of all the Python verisons needed.

When we run tox -f for a Python version and framework combination that is not specified in tox.ini then the tox command fails with the same exit code then it would when the test are run but failing. So we can not decide on that level if the Github actions failed or succeeded (meaning no tests to run, continue).

So I will park this PR for now.