mongodb_role: Tests. Add retries to delete tasks

[rhysmeister]

SUMMARY

Add retries to delete tasks. Module integration tests keep failing on these tasks.

ISSUE TYPE

• Bugfix Pull Request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.66%. Comparing base (0e2d6c8) to head (65558ff).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #728   +/-   ##
=======================================
  Coverage   73.66%   73.66%           
=======================================
  Files           6        6           
  Lines         934      934           
  Branches      143      143           
=======================================
  Hits          688      688           
  Misses        210      210           
  Partials       36       36           

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