Update YAMLs for aerosol VarBC (#61)

This PR updates jcb yamls for aerosol variational bias correction. 

Will add the obs bias section to yamls in observations/aero/ later as
more work is needed to select proper predictors.

Companion PRs:
 - NOAA-EMC/GDASApp#1426
 - NOAA-EMC/global-workflow#3189

Co-authored-by: ypwang19 <yaping.wang@users.noreply.github.com>
Co-authored-by: Cory Martin <cory.r.martin@noaa.gov>

algorithm/aero/aero_bias_staging.yaml.j2

@@ -0,0 +1,10 @@
+mkdir:
+- '{{aero_obsbiasout_path}}'
+copy:
+    {% for observation_from_jcb in observations %}
+    {% if use_observer(observation_from_jcb) %}
+    {% if observation_from_jcb in bias_files %}
+    - ['{{aero_obsbiasroot_path}}/{{aero_obsbiasin_prefix}}{{bias_files[observation_from_jcb]}}', '{{aero_obsbiasin_path}}']
+    {% endif %}
+    {% endif %}
+    {% endfor %}