Tests fail on Windows

[RodneyRichardson]

Three tests in Microsoft.ComponentDetection.Common.Tests are failing on Windows 11 using VS2022.

Looks like it should be skipped on Windows, as per other tests in the class

• DockerServiceTests.DockerService_CanPingDockerAsync

These look like they're intended to be skipped on Windows as thay have a SkipTestOnWindows attribute, but also have a redundant TestMethod attribute.

• SafeFileEnumerableTests.GetEnumerator_CallsSymlinkCode
• SafeFileEnumerableTests.GetEnumerator_DuplicatePathIgnored

[FernandoRojo]

DockerServiceTests.DockerService_CanPingDockerAsync requires docker be installed and running, so that should be made to instead return inconclusive or conditionallly skipped on no-docker available. I agree with the other removals of TestMethod