[external logs] Add ec2 metadata env var for cloudwatch logs #6411
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Changing the metadata check to read the
AWS_EC2_METADATA_ENDPOINTenv var, so users can change the exact endpoint they use to check for if they can use a role.Tested (run the relevant ones):
bash format.sh/smoke-test(CI) orpytest tests/test_smoke.py(local)/smoke-test -k test_name(CI) orpytest tests/test_smoke.py::test_name(local)/quicktest-core(CI) orpytest tests/smoke_tests/test_backward_compat.py(local)Tested this on a setup with a non-default endpoint