Update the code to the latest DB schema

[simlmx]

This is what the code could look like with the new DB schema.

Still TODO:

• [x] Make sure the tests will pass when we bump pvsite-datamodels
• [x] Wait for https://github.com/openclimatefix/pv-site-datamodel/pull/50 to be done
• [x] Bump the version of the pv-site-datamodels dependency
• [x] Fix the tests
• [x] Review

CC @peterdudfield @devsjc

[codecov-commenter]

Codecov Report

Merging #36 (1e674bb) into main (a2f80bd) will increase coverage by 0.14%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   91.12%   91.26%   +0.14%     
==========================================
  Files          10        9       -1     
  Lines         248      252       +4     
==========================================
+ Hits          226      230       +4     
  Misses         22       22              

Impacted Files	Coverage Δ
pv_site_production/app.py	93.93% <100.00%> (+1.08%)	:arrow_up:
pv_site_production/data/pv_data_sources.py	94.04% <100.00%> (+0.37%)	:arrow_up:

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