[lldb][test] Mark DynamicValueTestCase XFAIL on Windows
The newly added test test_from_forward_decl in TestDynamicValue.py
by PR #137974 is failing on Windows due to issues with dynamic type
resolution. This is a known issue tracked in PR24663.
LLDB Windows on Arm Buildbot Failure:
https://lab.llvm.org/buildbot/#/builders/141/builds/8391
This change marks the test as XFAIL on Windows using the consistent
with how similar tests in the same file are handled.
