cmake build system: change default build type to `Release` (#36679)

This switches the default Make build type to `build_type=Release`.

This offers:
- higher optimization level, including loop vectorization on older GCC
- adds NDEBUG define, which disables assertions, which could cause speedups if assertions are in loops etc
- no `-g` means smaller install size

Downsides are:
- worse backtraces (though this does NOT strip symbols)
- perf reports may be useless
- no function arguments / local variables in debugger (could be of course)
- no file path / line numbers in debugger

The downsides can be mitigated by overriding to `build_type=RelWithDebInfo` in `packages.yaml`,
if needed.  The upside is that builds will be MUCH smaller (and faster) with this change.

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Co-authored-by: Gregory Becker <becker33@llnl.gov>

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