Find a way to run tests that require test-thread=1

[cijothomas]

These tests were not running since the rename of packages last year. Need to run them again in CI.

https://github.com/open-telemetry/opentelemetry-rust/pull/1822/files#diff-52afcc694c0ff8ff253441f42ff44d6b4734fe30ae9070f2ba07a668a10e7baaR14

[cijothomas]

test trace::runtime_tests::test_set_provider_multiple_thread_tokio ... ignored, requires --test-threads=1
test trace::runtime_tests::test_set_provider_multiple_thread_tokio_shutdown ... ignored, requires --test-threads=1
test trace::runtime_tests::test_set_provider_single_thread_tokio ... ignored, requires --test-threads=1
test trace::runtime_tests::test_set_provider_single_thread_tokio_shutdown ... ignored, requires --test-threads=1
test trace::runtime_tests::test_set_provider_single_thread_tokio_with_simple_processor ... ignored, requires --test-threads=1

These tests do not exist for logs, metrics. It probably makes sense to add them for metrics.