[google-cloud-cpp] update to latest (v1.28.0) version

[coryan]

• What does your PR fix?

N/A. It updates google-cloud-cpp to the latest release (v1.28.0). One of the new things in this release is the -DGOOGLE_CLOUD_CPP_ENABLE_EXAMPLES=OFF option, which eliminates the need for disable-benchmarks.patch.

• Which triplets are supported/not supported? Have you updated the CI baseline?

No change.

• Does your PR follow the maintainer guide?

Yes.

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

Yes.

[JonLiu1993]

@coryan ,Thanks for your pr,please add 'vcpkg_fixup_pkgconfig()' below '

vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake TARGET_PATH share)

in portfile.cmake

[coryan]

Done, please take another look.

[ras0219-msft]

It looks like the grpc pkgconfig files are not fixed up; we'll need to add similar commands to that and abseil before google-cloud-cpp will be able to properly support pkgconfig.

[coryan]

Ugh. I have reverted the pkgconfig change for now. I can send PRs for Abseil and gRPC if you want me to and then send a PR for google-cloud-cpp. I could create a PR will all the changes, but that sounds complicated and more risky.

[ras0219-msft]

Thanks a bunch; I think doing all three at the same time would be small enough to be put into a single PR, but separate is definitely the "proper" solution :)