Diss est fix

[JosephMouallem]

Description

This MR fixes two issues with dissipation heating that arise in the following cases:
1- diss_est in the whole domain when do_vort_damp=.F.: damp_v will not allow a correct computation of local arrays ut, vt computed by del6_vt_flux and needed for the calculation of diss_est
2- diss_est in the sponge layers when do_vort_damp=.T.: d_con_k=0 in the sponge layers (set just before calling d_sw for k=1,2,3), this will not allow a correct computation of ub, vb since there is one condition (d_con > 1.e-5). ub, vb are used later to compute diss_est

This code change will fix ub, vb, ut, vt needed for the calculation of dissipative heating diss_est

Fixes #294

How Has This Been Tested?

Idealized tests on Gaea

Checklist:

Please check all whether they apply or not

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[laurenchilutti]

I haven't reviewed the code changes, but I do want to point out that it seems the CI checks are failing due to Parallelworks Cloud cluster issues. I am hoping to restart the cluster and that the CI will begin to run again.