Add if check for existing partition

[conbrad]

If table has already been created, the partitioning script will continue, in the case where a migration includes adding a new partition.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.27%. Comparing base (d31d733) to head (8705b84).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4152      +/-   ##
==========================================
- Coverage   80.78%   80.27%   -0.52%     
==========================================
  Files         310      310              
  Lines       11896    11896              
  Branches      537      537              
==========================================
- Hits         9610     9549      -61     
+ Misses       2168     2161       -7     
- Partials      118      186      +68     

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