Change Windows CI build type

[WeiqunZhang]

In one of the Windows CI, we use cmake --build build --config RelWithDebInfo. This seems to suggest that the build type is RelWithDebInfo. However, for reasons we don't understand, that's not the case. In @ax3l's words,

Usually, VS Studio (and a few other generators) are multi-config generators. That means their "makefiles" are configured to be able to build Debug/Release/RelWithDebInfo/etc. all at the same time in the build phase. Generally, that means we have to pass --config ... to the build and install step and -DCMAKE_BUILD_TYPE cannot be passed to the configure step.

Anyway, if we make the changes in this PR (i.e., setting CMAKE_BUILD_TYPE), the build type does become RelWithDebInfo. Furthermore, the CI time went down from 1.5 hours to 6 minutes.

Below is the diff of compiler flags used.

7,8c7,8
< /Od
< /Ob0
---
> /O2
> /Ob1
10a11
> /D NDEBUG
12c13
< /D "CMAKE_INTDIR=\"Debug\""
---
> /D "CMAKE_INTDIR=\"RelWithDebInfo\""
15,16c16
< /RTC1
< /MDd
---
> /MD
23,24c23,24
< /Fo"amrex_3d.dir\Debug\\"
< /Fd"D:\a\amrex\amrex\build\Src\Debug\amrex_3d.pdb"
---
> /Fo"amrex_3d.dir\RelWithDebInfo\\"
> /Fd"D:\a\amrex\amrex\build\Src\RelWithDebInfo\amrex_3d.pdb"