Docs: update instructions for Fugaku supercomputer (Riken, Japan)

[lucafedeli88]

This PR updates the scripts and the instructions to compile WarpX for the Fugaku supercomputer.
The PR introduces also a small change to BinaryCollision.H . The reason is that the Fujitsu compiler in clang mode is based on an old version of clang and sees this code as an error (see here, code snippet copied from here ):

struct T {
    T() noexcept(false) { }
    ~T() noexcept(false) { }
};

struct A
{
    A() noexcept = default;
    ~A() noexcept = default;
    T t;
};

while more modern compilers silently delete the noexcept methods.

I've also removed polly from the compilation flags since otherwise I observe a crash of the Fujitsu compiler. Removing polyhedral optimizations does not seem to affect performances.

[ax3l]

Thank you! ✨