gitlab-ci: Update non-packaging Windows builds to MSVC 14.33 toolset

Brad Kingrequested to merge
brad.king/cmake:ci-msvc-14.33 into master

Restore the change from !7578 (merged), but not for packaging jobs. cmake-gui is still buggy when compiled with the newer toolset.

Use separate MSVC toolset specification for packaging jobs. This will be useful for testing CMake with one version of MSVC while packaging the official binaries with another version.

Issue: #23859 (closed)
Backport: release

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