update get_gsp_yield_sum

[rachel-labri-tipton]

Pull Request

Description

Updates get_gsp_yield_sum to return numeric values for solar_generation_kw in GSPYieldSQL.

I also ran black formatter on the code, which explains the updated spacing.

Fixes #208

How Has This Been Tested?

I ran the Docker tests, and all tests in test_read_gsp.py passed.

• [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 #209 (896f2d0) into main (017454b) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #209   +/-   ##
=======================================
  Coverage   94.98%   94.99%           
=======================================
  Files          27       27           
  Lines        1676     1677    +1     
=======================================
+ Hits         1592     1593    +1     
  Misses         84       84           

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read_gsp.py	100.00% <100.00%> (ø)

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