Add integration test fixtures and compute-sdk-test github action

[itsrainy]

These are the integration tests from the compute-tinygo repo with a few changes:

1. I've removed the tests that run on C@E for now and kept the Viceroy tests. The C@E tests will be helpful in the future, but we'll need to write them in a way that they aren't clobbering each other if two people/actions/PRs are running the tests at the same time.
2. Removed references to un-needed service IDs and C@E endpoints from the test config
3. Moved the github action from the compute-sdk-ci-github-action directly into this repo, similar to how we've done for the js-compute-runtime repository

Since the action has been moved directly to this repo, a github token is no longer needed to run the integration tests locally, so I've updated the _run_integration_tests.sh script accordingly.

[dgryski]

A few comments, but otherwise looks great.

[dgryski]

deleted an e

[dgryski]

LGTM.