Remove them from LevelGridBuilder

fixes pipeline #7586

cherry-picked from d954628

in Parameter.cpp

For communication after interpolation fine to coarse

when looking for the sendIndices for the communication after f to c

needed for new method which reorder send and receive indices

Find all send and recv indices which also are interface cells fine to coarse, coarse (iCellFCC).
Move them to the front of the vector of send and recv indices. Return their number as well.

(cherry picked from commit 3191433948c45d04b49729cc92e9b54796981a7f)