access: do not leak missing environments
Only the admin should be able to see whether the environment associated to an id exists. Other users trying to access an env they didn't create should see a 403, whether the env exists or not
Bug: T381586
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Only the admin should be able to see whether the environment associated to an id exists. Other users trying to access an env they didn't create should see a 403, whether the env exists or not
Bug: T381586