attempt to load 15 minute data if needed for satellite

[peterdudfield]

Pull Request

Description

• Ability to load 15 minute satellite data if needed. This is done by checking the last timestamp and seeing if its less than 1 hour ago

Helps https://github.com/openclimatefix/PVNet/issues/31

How Has This Been Tested?

• CI tests

• Added a test, to load 15 minute data, if no 5 minute data

• Added a test, to load 15 minute data, if 5 minute data is odd

• [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
• [ ] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #209 (bab6d64) into main (09cbed4) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   81.27%   81.31%   +0.04%     
==========================================
  Files         128      128              
  Lines        5511     5539      +28     
==========================================
+ Hits         4479     4504      +25     
- Misses       1032     1035       +3     

Impacted Files	Coverage Δ
ocf_datapipes/training/common.py	95.06% <ø> (ø)
ocf_datapipes/load/satellite.py	90.81% <100.00%> (+3.67%)	:arrow_up:

... and 1 file with indirect coverage changes

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