CI: Avoid htz4 runner for VS2019

The htz4 runner needs to be updated in order for our support binaries
like Chocolatey to work. Temporarily restrict jobs to the EC2 runner
until this has happened.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4371>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4371>
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