Tests may depend on incorrect method to discriminate climatological variables

[rod-glover]

The test (roughly rendered) cell_methods ~ '(within|over)' no longer gives correct results. Instead we must use (rendered as SQL)

ARRAY['climatology'::text] <@ variable_tags(meta_vars.*)

or its complement

ARRAY['observation'::text] <@ variable_tags(meta_vars.*)

Various fixes for this will be applied throughout the PDP stack, including in the databases:

• https://redmine.pcic.uvic.ca/issues/1974
• Database queries use incorrect method to discriminate climatological variables pydap.handlers.pcic#7
• Database queries use incorrect method to discriminate climatological variables pdp_util#50

In this repo, we may still be assuming the old method is still in use. See:

• pdp/pdp/static/js/__mocks__/data-services/prism_demo_app.js

  Line 430 in b678ccc

  ' String cell_methods "time: sum within months time: mean over years";',

• pdp/tests/test_functional.py

  Line 150 in b678ccc

  assert var.cell_method == 't: sum within months t: mean over years'

Fix these if necessary.