A variable temperature EPR study of Cu$^{2+}$ doped single crystals of pyrovanadates $\beta$-Mg$_{2}$V$_{2}$O$_{7}$, $ \alpha$-Zn$_{2}$V$_{2}$O$_{7}$: estimations of non-coincident $\tilde{\mathbf{g}}^{2}$- and $\tilde{\mathbf{A}}^{2}$-tensors