marketplace: check for terminated subscriptions when fetching details (PROJQUAY-7035)

[Marcusk19]

If a subscription is deleted in the subscription watch API it will set the field terminatedDate for the subscription object. This should be taken into consideration when fetching a subscription's details and the subscription should be removed from an org if it is terminated like how we already do for expired subscriptions.

[kleesc]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 70.90%. Comparing base (65e7270) to head (97dd161).
Report is 2 commits behind head on master.

Files	Patch %	Lines
endpoints/api/billing.py	60.00%	0 Missing and 2 partials ⚠️
util/marketplace.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2834   +/-   ##
=======================================
  Coverage   70.90%   70.90%           
=======================================
  Files         437      437           
  Lines       40852    40860    +8     
  Branches     5354     5355    +1     
=======================================
+ Hits        28966    28973    +7     
- Misses      10190    10191    +1     
  Partials     1696     1696           

Flag	Coverage Δ
unit	70.90% <73.33%> (+<0.01%)	⬆️

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