* mongo: support readPreference in findOne

[ctmillerlin]

This pull request makes a targeted improvement to the findOne method in MongoCollectionImpl.java by ensuring that the collection is accessed with the correct read preference specified in the FindOne parameter. This helps ensure that read operations can be directed to the appropriate MongoDB replica set member as needed.

• core-ng-mongo/src/main/java/core/framework/mongo/impl/MongoCollectionImpl.java: Updated the findOne method to use the readPreference from the FindOne object when accessing the collection.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.85%. Comparing base (eae0401) to head (e8421b2).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #70   +/-   ##
=========================================
  Coverage     79.84%   79.85%           
  Complexity      400      400           
=========================================
  Files           538      538           
  Lines         15111    15111           
  Branches       2036     2036           
=========================================
+ Hits          12066    12067    +1     
+ Misses         2224     2223    -1     
  Partials        821      821           

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