Remove advection from auxiliary quantities B_k

[dmontgomeryNREL]

This PR includes the following:

1. Fixed a minor typo in the FlowPastCylinder documentation.
2. Updated the auxiliary quantities ($B_k$ in documented equations) so that they are no longer advected. These equations are identical to the advected quantities $A_k$. The new auxiliary quantities provide users the option to include state variables that are stationary in space. Since these equations were previously identical to the advected quantities, this should not negatively impact users.
3. Added a test case in RegTests that illustrates how to utilize the advected and auxiliary quantities. I tested the updated code with Godunov, MOL, AMR, and a simple EB.

[baperry2]

Two things:

I am see some movement of one of the stationary scalars where it intersects the EB. Maybe something to do with state redistribution? But it isn't just immediately next to the surface.

Let's have this case run in the CI, similar to what we did for the flow over a cylinder case: https://github.com/AMReX-Combustion/PeleC/pull/827#pullrequestreview-2181243887

[dmontgomeryNREL]

No more movement near the EB!

[dmontgomeryNREL]

I removed $\rho$ from the auxiliary quantity equation altogether after discussing a problem with @baperry2 . The new equation is simply $\frac{\partial Bk}{\partial t} = S{ext,B_k}$. I verified the implementation for a simple exponential decay source term at a single point in space.