Will check 5 min sat data exists

[peterdudfield]

Pull Request

Description

checks if 5 min satellite data is there or not, and then loads 15 minute data

How Has This Been Tested?

Added a test, to check if only _15 sat file is there, it stil works. (it caught a different bug, so I'm happy i wrote this)

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #720 (57041e5) into main (2a1226d) will decrease coverage by 0.07%. The diff coverage is 82.60%.

@@            Coverage Diff             @@
##             main     #720      +/-   ##
==========================================
- Coverage   92.91%   92.84%   -0.08%     
==========================================
  Files          49       49              
  Lines        3459     3480      +21     
==========================================
+ Hits         3214     3231      +17     
- Misses        245      249       +4     

Impacted Files	Coverage Δ
nowcasting_dataset/data_sources/fake/batch.py	87.12% <ø> (ø)
nowcasting_dataset/data_sources/gsp/eso.py	67.12% <33.33%> (ø)
nowcasting_dataset/config/model.py	91.81% <60.00%> (-1.18%)	:arrow_down:
...et/data_sources/satellite/satellite_data_source.py	93.68% <93.10%> (+0.04%)	:arrow_up:
nowcasting_dataset/config/save.py	100.00% <100.00%> (ø)
nowcasting_dataset/data_sources/fake/utils.py	94.44% <100.00%> (ø)
nowcasting_dataset/filesystem/utils.py	97.59% <100.00%> (ø)

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