CoDICE L2 metadata work

[tech3371]

[mstarkey2158]

In the Lo l1a and direct event products, the nso and rgfo variables currently have VAR_TYPE = 'data'. These are not data variables but rather supporting variables. This should be changed in all files in which these variables appear. Specifically we should check this for the following variables:
rgfo_half_spin
rgfo_spin_sector
rgfo_esa_step
nso_half_spin
nso_spin_sector
nso_esa_step