Clean Pip Staging Directory (#2954)

* Clean Pip Staging Directory

The distutils staging (`build` -> `_tmppythonbuild`) directory that
pip uses to collect build artifacts is not by default cleaned between
multiple `pip` runs.

This can be confusing when we recompile, because old `libwarpx*` files
can be still in it that are not present in our own `build/lib/`.

This cleans that staging directory before builds now.
It also sets the whole `build_base` so that no artifact lands in the
default, which was `build/`. So far, `bdist.linux-x86_64/` still was
out-of-tree.

* Python_background_mcc_1d: Add CMake Options

Add missing CMake options in `WarpX-tests.ini`.

This must have been merged in parallel to when we modernized our
regression tests end of last year. #2556

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