get gsp list from pvlive, not url

[peterdudfield]

Pull Request

Description

update to use pvlive to load gsp metadata

Fixes #

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] 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-commenter]

Codecov Report

Merging #714 (43ea8f0) into main (cfecf83) will increase coverage by 0.04%. The diff coverage is 76.47%.

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
+ Coverage   92.86%   92.91%   +0.04%     
==========================================
  Files          48       48              
  Lines        3463     3458       -5     
==========================================
- Hits         3216     3213       -3     
+ Misses        247      245       -2     

Impacted Files	Coverage Δ
nowcasting_dataset/manager/manager.py	99.37% <ø> (ø)
nowcasting_dataset/data_sources/gsp/eso.py	67.12% <50.00%> (-1.01%)	:arrow_down:
nowcasting_dataset/data_sources/gsp/pvlive.py	95.52% <80.00%> (-4.48%)	:arrow_down:

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