Fix team delete for unmanaged-billing team

[knolleary]

Description

The current delete team path attempts to cancel the stripe subscription without taking into account whether the team's billing is unmanaged. This fixes that.

Along the way, a small fix in the stub driver that blocked deleting 'suspended' instances in local testing.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (c7b9f95) 40.20% compared to head (257a980) 40.20%.

Files	Patch %	Lines
forge/ee/lib/billing/index.js	25.00%	3 Missing ⚠️
forge/routes/api/team.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3181   +/-   ##
=======================================
  Coverage   40.20%   40.20%           
=======================================
  Files         582      582           
  Lines       21353    21352    -1     
  Branches     5137     5137           
=======================================
  Hits         8584     8584           
+ Misses      12769    12768    -1     

Flag	Coverage Δ
backend	76.22% <20.00%> (ø)
frontend	1.97% <0.00%> (+<0.01%)	⬆️

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