Add site preference model to store overlaps threshold

[danangmassandy]

This is for #2010

[lgkgh]

Jenkins Build Details:

Build status: SUCCESS Build duration: 8 min 21 sec

[lgkgh]

Jenkins Build Details:

Build status: FAILURE Build duration: 1 min 12 sec

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
16754	16256	97%	0%	🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: 309b71d by action🐍

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.93939% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 97.23%. Comparing base (3590d8b) to head (309b71d). Report is 2 commits behind head on main.

Files	Patch %	Lines
django_project/core/models/singleton.py	76.92%	3 Missing :warning:
django_project/core/models/preferences.py	84.61%	2 Missing :warning:
django_project/core/migrations/0001_initial.py	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2013 +/- ## ========================================== - Coverage 97.25% 97.23% -0.03% ========================================== Files 365 373 +8 Lines 16403 16556 +153 ========================================== + Hits 15953 16098 +145 - Misses 450 458 +8 ```

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[lgkgh]

Jenkins Build Details:

Build status: SUCCESS Build duration: 9 min 37 sec

[lgkgh]

Jenkins Build Details:

Build status: FAILURE Build duration: 1 min 31 sec

[lgkgh]

Jenkins Build Details:

Build status: SUCCESS Build duration: 9 min 37 sec

[lgkgh]

Jenkins Build Details:

Build status: SUCCESS Build duration: 10 min