Reduce number of modules being generated and loaded

[climbfuji]

Is your feature request related to a problem? Please describe.

One complaint about spack-stack is that the environments define so many modules that are all loaded as dependencies. Not all of those are necessary (because some are build-time dependencies only but not declared as such; others are run-time dependencies but don't need to be loaded because of RPATH or dynamic linking).

Describe the solution you'd like

Reduce the number of modules being generated and loaded by extending the exclude list in config/common/modules_*.yaml.

Additional context

There are other alternatives that we can explore in the future, for example spack views (for all dependencies or the Python dependencies only). These solutions will require changes in the downstream applications (build system, runtime config). Maybe we can get away with excluding more modules and being more selective about what we need to load for a certain application.