POLIO-1753: split pdf repository data per vaccine per round

[quang-le]

Rounds can have several vaccines. The pdf table in the repository should reflect that and have one line per round per vaccine

Related JIRA tickets : POLIO-1753

Self proofreading checklist

• Did I use eslint and black formatters
• Is my code clear enough and well documented
• Are my typescript files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• My migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Doc

Comments in the code

Changes

• Change get_queryset method of VaccineRepositoryViewSet to return a union of the rounds_queryset filtered by each vaccine (so: 1 queryset with all rounds with nopv2, 1 for mopv2 and 1 for nopv), so that rounds with multiple vaccines are duplicated.
• Because we use a union queryset, all the filtering logic was moved to get_queryset because .filter() cannot be called on a union queryset
• Filter pdfs by vaccine name
• Add a 'vaccine` column in the table
• Add tests

How to test

On a recent polio test DB:

• Go to vaccine repository.
• Find a campaign with multiple vaccines
• There should be one line per vaccine and per round
• Play with ordering and filtering

Print screen / video

Notes

Merges in to #1822

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[quang-le]

I put it back to draft status because the file filter is now buggy, but the rest can already be reviewed

[kemar]

LGTM