Do not create a new mongo client on every context execution

[cesarvarela]

closes #2816

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.33%. Comparing base (03afdc3) to head (d597cd8).

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2817      +/-   ##
===========================================
- Coverage    99.33%   99.33%   -0.01%     
===========================================
  Files           12       12              
  Lines         4845     4843       -2     
  Branches        25       41      +16     
===========================================
- Hits          4813     4811       -2     
+ Misses          32       31       -1     
- Partials         0        1       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.