fix CI

[bashbaug]

Fixes various issues preventing CI from passing on the latest GitHub runners:

• Updates to Visual Studio 2026 instead of Visual Studio 2022.
• Removes the explicit CMake install step and uses the (newer) default CMake and ninja instead.
• Updates the version for several third-party dependencies (freetype, GLEW, glm). The older versions did not work with a newer CMake.
• Removes the output directory overrides for several third-party dependencies that no longer work with the updated versions. Removes a few more output directory overrides that are not required, for consistency.
• Only build the static GLEW library. The shared version was not building in CI, and the static version is the only version that is needed,
• Disable the blur tests from Linux CI, since they are failing unexpectedly (issue filed: blur samples are failing in Linux CI #158).

Note, I also enabled CI on pushes to branches other than main. I can revert this if desired, but it will mean that CI will only run when a PR is created.