Follow-up fixes to default filters

[mihow]

Summary

Several small issues were discovered related to the default filters recently introduced in #951 & #954.

Detailed Description

• Filters are not applied to charts in the session detail view (non-lepidoptera still showing in top 10)
• Need to add some include & exclude taxa to all existing projects, perhaps make it a default for new projects
• Cached counts related to Stations (# occurrences) are not updated when the default filters change
• Taxa detail pages return 404 if they don't pass the default filters. (http://localhost:4000/projects/24/taxa/4541?taxa_list_id=15&include_unobserved=true&ordering=-occurrences_count)

Implementation Details

Each issue has a different implementation.

1. Add the reusable filter method to the query used for chart data (check the project summary charts as well)

2. Add a migration, add environment variables similar to default pipelines for default include & excludes. Create a new get_project_default_filters function to read those variables and call it from the get_or_create_default_project function to set the default filter fields in the ProjectSettingsMixin

3. Multiple options. Remove cached values if the query can be fast enough to be dynamic, or bust the cache of these values when the filters are changed (perhaps a signal that checks if the default filter values were modified, then resave related models that have cached counts of occurrences or taxa)

4. Add the apply_defaults query param to the taxa detail page (with the other filter query params) - ensure the get_queryset for the detail view action ignores apply_defaults (or defaults to False). Move this queryset filter under the list view conditional.

I recommend fixing 1 & 4 first. Then another PR(s) for 2 & 3

[mihow]

@mohamedelabbas1996 I can confirm that the session detail pages are not using the default filters in this top taxa chart (see how Not Lepidoptera still appears)

[mohamedelabbas1996]

@mihow That’s interesting. it actually works for me with the Not a Moth taxon being correctly excluded.