This PR removes the errors.go from the /internal/internaltest directory,
as they are no longer used in the project.
Additionally, this PR updates the gen.go file in the internal package to
reflect the removal of these unused files.
Closes https://github.com/open-telemetry/opentelemetry-go/issues/6521.
Co-authored-by: Robert Pająk <pellared@hotmail.com>
This PR removes the env.go and env_test.go files from the
/internal/internaltest directory, as they are no longer used in the
project.
Additionally, this PR updates the gen.go file in the internal package to
reflect the removal of these unused files.
Closes
[#6526](https://github.com/open-telemetry/opentelemetry-go/issues/6520).
