Update ONC VENUS nodes model/obs comparison figure module

[douglatornell]

• Handle missing dev run fields because we stopped running nowcast-dev with the release of v202111
• Update code that collects observations from ONC to use the v3 API

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 10.00000% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 77.77%. Comparing base (ecc0aa2) to head (7e471b5).

Files	Patch %	Lines
nowcast/figures/comparison/compare_venus_ctd.py	6.66%	14 Missing :warning:
nowcast/workers/make_plots.py	0.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #254 +/- ## ========================================== - Coverage 77.79% 77.77% -0.03% ========================================== Files 133 133 Lines 18817 18822 +5 Branches 1910 1914 +4 ========================================== Hits 14639 14639 - Misses 4111 4116 +5 Partials 67 67 ``` | [Flag](https://app.codecov.io/gh/SalishSeaCast/SalishSeaNowcast/pull/254/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SalishSeaCast) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/SalishSeaCast/SalishSeaNowcast/pull/254/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SalishSeaCast) | `77.77% <10.00%> (-0.03%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SalishSeaCast#carryforward-flags-in-the-pull-request-comment) to find out more.

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