Explicitly mark tests with CLRTestKind=SharedLibrary (#61235)

Explicitly mark tests with CLRTestKind=SharedLibrary (#61235)

Previously the Directory.Build.targets script used to automatically
infer that OutputType=Library without a CLRTestKind implies
SharedLibrary. This is however hard to consolidate with the planned
test merging - as the SDK script set OutputType=Library by default,
we need the combination Library+(implicit)BuildAndRun to indicate
the "new-style" [Fact]-based tests. For this reason I propose to
remove this automatic inference and manually fix the handful of tests
that are missing an explicit CLRTestKind=SharedLibrary property.
In light of this description we can theoretically remove the
OutputType=Library specification from all test projects but even if
we decide to do that, I believe it will be easier to do that as a
separate mechanical change, not as part of this relatively small
change that has a different purpose. Additionally in the one case
of the GitHub_22583 regression test, I removed the explicit setting
of GenerateRunScript=false because that's the default.

Fix OutputType=exe in OpenDelegate.csproj

I believe this was a pre-existing bug - previously, with the
special clause regarding SharedLibrary, the test just got silently
skipped because it was considered to be a shared library.

Thanks

Tomas