blend plevels like we do for main variable

[peterdudfield]

Pull Request

Description

Blend plevel like we do main expectation value (or the mean value). This means 0-7 hours are pvenet 7-8 are mix 8 onwards are National_xg

Before we were just taking National_xg probability levels

before (from pro)

after (from dev- after running locally)

Fixes #12

How Has This Been Tested?

• [x] CI tests

• [x] run locally, re ran on 2023-10-04 and probablisitic looked reasonable

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] 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[bot]]

Codecov Report

Merging #13 (e1ca8b6) into main (9a00f58) will increase coverage by 1.22%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   95.35%   96.58%   +1.22%     
==========================================
  Files           4        4              
  Lines         323      322       -1     
==========================================
+ Hits          308      311       +3     
+ Misses         15       11       -4     

Files	Coverage Δ
forecast_blend/app.py	92.75% <ø> (ø)
forecast_blend/blend.py	98.18% <100.00%> (+3.53%)	:arrow_up:
forecast_blend/utils.py	97.24% <100.00%> (ø)

... and 1 file with indirect coverage changes

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