refactor(python): Use datetime_to_int util for AnyValue conversion

[stinodego]

Changes

• Use the existing datetime_to_int util instead of _datetime_for_any_value/_datetime_for_any_value_windows.

These Python utils were introduced in #8209, but there already existed a util to do that conversion. I tested the performance and it's basically identical.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.06%. Comparing base (d4ee7a7) to head (dc9766f).
Report is 2 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14743   +/-   ##
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  Coverage   81.06%   81.06%           
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  Files        1322     1322           
  Lines      171364   171327   -37     
  Branches     2461     2454    -7     
=======================================
- Hits       138910   138883   -27     
+ Misses      31983    31976    -7     
+ Partials      471      468    -3     

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