feat: trial management in sales dashboard

[dabeeeenster]

This is so the sales team can manage folk going into and coming out of trials.

We need to clear up how we manage this data as we currently have two areas of the database that store this data, and we need to figure out which to honour based on the subscription state.

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[github-actions]

Uffizzi Preview deployment-36789 was deleted.

[novakzaballa]

LGTM

[codecov-commenter]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (e62be85) 95.53% compared to head (eceaa5f) 95.49%.
Report is 95 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2805      +/-   ##
==========================================
- Coverage   95.53%   95.49%   -0.04%     
==========================================
  Files         994     1013      +19     
  Lines       28072    29287    +1215     
==========================================
+ Hits        26818    27969    +1151     
- Misses       1254     1318      +64     

Files	Coverage Δ
api/sales_dashboard/urls.py	100.00% <ø> (ø)
api/organisations/models.py	93.93% <66.66%> (+0.30%)	⬆️
api/sales_dashboard/views.py	57.97% <33.33%> (-3.32%)	⬇️
api/sales_dashboard/forms.py	50.98% <29.62%> (-25.02%)	⬇️

... and 64 files with indirect coverage changes

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