Invalidate cache after deactivation in renewal flow

[aviupadhyayula]

Adds cache invalidation to deactivation script. Adds test case that checks whether cached clubs are flushed after running deactivation command.

For context: we run a command to deactivate all clubs at the beginning of the year. This kicks off the renewal cycle. The command changes club attributes but doesn't invalidate the cache. This results in incorrect behavior -- the frontend marks clubs as having been approved prematurely.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.29%. Comparing base (eb96a3d) to head (52dbea2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #712      +/-   ##
==========================================
+ Coverage   71.17%   71.29%   +0.11%     
==========================================
  Files          31       31              
  Lines        6835     6841       +6     
==========================================
+ Hits         4865     4877      +12     
+ Misses       1970     1964       -6     

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