Fix broken web site time series plots.

[douglatornell]

Web site time series plots broke when v202111 was released because the ERDDAP URLs that they use to access the model results were not updated.

Also improve make_plots worker unit tests:

• Replace unittest.mock.patch decorator with pytest caplog fixture re: issue #82
• Add unit tests for production YAML config file elements related to worker re: issue #117

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.79%. Comparing base (2bdd7ca) to head (dbdb26b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #249 +/- ## ========================================== + Coverage 77.73% 77.79% +0.06% ========================================== Files 133 133 Lines 18769 18817 +48 Branches 1906 1910 +4 ========================================== + Hits 14590 14639 +49 + Misses 4112 4111 -1 Partials 67 67 ``` | [Flag](https://app.codecov.io/gh/SalishSeaCast/SalishSeaNowcast/pull/249/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/249/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SalishSeaCast) | `77.79% <100.00%> (+0.06%)` | :arrow_up: | 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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