Verify registry entries for all interfaces in the integration test

IID entries under `Software\Classes\Interface`:
* ProxyStubClsid32 entry should point to the OLE automation marshaler
* TypeLib entry should be equal to the IID.

TypeLib entries under `Software\Classes\TypeLib`:
* Read the typelib path under both `win32` and `win64`.
* Confirm that the typelib can be loaded using ::LoadTypeLib.
* Confirm that the typeinfo for each interface can be loaded from the
typelib.

Bug: 1341471
Change-Id: Ib8e25de2197afa4fc715f066a88ab2453f0c622f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3863385


Reviewed-by: Xiaoling Bao <xiaolingbao@chromium.org>
Commit-Queue: S Ganesh <ganesh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1040597}