Update to WindNet and PVNet Site datapipes

[jacobbieker]

Pull Request

Description

Please delete the italicised instruction text! Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

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[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f32e42f) 76.26% compared to head (b43869c) 76.36%. Report is 1 commits behind head on main.

Files	Patch %	Lines
ocf_datapipes/training/pvnet_site.py	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #271 +/- ## ========================================== + Coverage 76.26% 76.36% +0.09% ========================================== Files 122 122 Lines 5767 5753 -14 ========================================== - Hits 4398 4393 -5 + Misses 1369 1360 -9 ```

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