Feature/pdct 1759 make backend config endpoint focused on corpora not

[annaCPR]

Description

• add a new top-level corpus_types object to the /config response

• update each corpus within the corpus_types object to include org ID and name

• update count_by_category and total to count families per corpus (rather than org) and add to each corpus object in the response

• update relevant tests to check for the new structure

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Reviewer Checklist

• DB_CLIENT DEPENDENCY IS ON THE LATEST VERSION
• The PR represents a single feature (small driveby fixes are also ok)
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[linear]

PDCT-1759 Make backend /config endpoint focused on corpora, not organisations

[katybaulch]

Missing some docstrings for your new functions (sorry 😢) but otherwise all good!