add more verbose logs, for see where the nans are in the satellte data

[peterdudfield]

Pull Request

Description

• fix for pvnet 15 minute satelltie data, added production flag
• added some more logging when there are zeros in satellite data

• Helps with https://github.com/openclimatefix/PVNet/issues/49

How Has This Been Tested?

CI tests and ran locally wiht 15 minute satellite data

• [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
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #215 (1be38aa) into main (547c314) will decrease coverage by 0.04%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   81.42%   81.39%   -0.04%     
==========================================
  Files         128      128              
  Lines        5556     5568      +12     
==========================================
+ Hits         4524     4532       +8     
- Misses       1032     1036       +4     

Impacted Files	Coverage Δ
ocf_datapipes/training/pvnet.py	82.22% <90.90%> (+0.56%)	:arrow_up:
ocf_datapipes/load/satellite.py	91.00% <100.00%> (+0.09%)	:arrow_up:

... and 1 file with indirect coverage changes

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