Look for the closest declination line and adequate NSB random forest model for DL2 production

[marialainez]

Choose the adequate RF model in the [declination lines x NSB] MC grid.

Closes #275 (initially for just choosing the declination MC track closest to the target declination)

[codecov]

Codecov Report

Attention: Patch coverage is 85.18519% with 12 lines in your changes missing coverage. Please review.

Project coverage is 81.58%. Comparing base (e589deb) to head (cbdee3e).
Report is 14 commits behind head on main.

❗ Current head cbdee3e differs from pull request most recent head 9b4b441

Please upload reports for the commit 9b4b441 to get more accurate results.

Files	Patch %	Lines
src/osa/paths.py	81.81%	8 Missing ⚠️
src/osa/utils/utils.py	66.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   79.76%   81.58%   +1.81%     
==========================================
  Files          59       57       -2     
  Lines        5144     4984     -160     
==========================================
- Hits         4103     4066      -37     
+ Misses       1041      918     -123     

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[morcuended]

@moralejo, I was going to comment in today's meeting. The way we look for the adequate RF model declination track is by using the pointing information from the TCU database (specifically the target coordinates), not checking the average pointing information inside the data files as you mentioned. Is this fine?

[moralejo]

Since the relevant pointing is the one in celestial coordinates, the target coordinates are perfectly fine for standard observations (if we ever do something like drift scans we will anyway have to do some custom work).