Tests in DataDogExporter test failing only in github action

[bryce-b]

https://github.com/open-telemetry/opentelemetry-swift/blob/main/Tests/ExportersTests/DatadogExporter/DatadogExporterTests.swift#L101

I'm running into this issue in my pr #541 so I disable this test. Here is an example of the failed test: https://github.com/open-telemetry/opentelemetry-swift/actions/runs/9370698948/job/25798280923

This failure only occurs on github builds, and not locally.
I thought it might have to do with the xcode version, so I tried applying maxim-lobanov/setup-xcode workflow action, but it didn't help.

[bryce-b]

I've disabled these tests temporarily