Include SolarAnywhere API key in pytest-remote-data.yml

[AdamRJensen]

This PR includes the SolarAnywhere API key in the pytest-remote-data.yml file. The API key is used for testing in #1497, however, it needs to be available to the main branch prior to merging of #1497 as the API key is required for the remote tests to work.

I think it is just the annoying but secure behavior of pull-request-target not respecting yml changes in the PR -- your update to include the SA key in the environment isn't taking effect because the action is defined by the .github/workflows/pytest-remote-data.yml file on master, not this PR branch. I guess the cleanest workaround is to submit a separate PR to change pytest-remote-data.yml, merge that, then merge master into this PR?

Originally posted by @kanderso-nrel in #1497 (comment)