Introduces psd_v23a

The psd_v22a recreated with the middle volumes, shield and modules removed for the beampipe to pass through.

Dear @f.uhlig, @c.muentz, @m.deveaux, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

@e.clerkin,

could you please rebase locally.

assigned to @f.uhlig

closed