Microsoft.VisualBasic.MyServices.Tests.ClipboardProxyTests Tests randomly fail

[paul1956]

Test

ClipboardProxyTests.Text is the one that fails most often.

Issue description

Clipboard Tests still randomly fail. The 8 tests in ClipboardProxyTests should be moved and combined with other Clipboard tests and this file should be deleted or the same fixes done in other Clipboard tests should be applied to these tests. Adding a delay as in other tests is one way to address this issue.

These tests are in C#, please do not assign this to me unless you just want the file deleted.

[Tanya-Solyanik]

ClipboardProxyTests are in a separate test assembly, we didn't enable parallelism between different assemblies, so there is no reason to move these tests.
Delays could be added to these tests, they can share the test base class with the ClipboardTests from the S.W.F.Tests assembly if that base class is moved to utilities.

[paul1956]

@Tanya-Solyanik if delay is added to test base class, I can update these tests if no one else wants to do it.