Re-assess OS requirements for snapshot unit tests

[amanda-hi]

The Problem

Currently, snapshots for plots are not generated when run on Mac or Windows operating systems (this is defined in tests/testthat/helper.R, see here). This is an artifact from previous versions of SomaLogic plotting code, and no longer makes sense in the context of SomaPlotr package development and maintenance, which is primarily done on Mac OS (previously, it was Linux).

Skipping snapshots on Mac OS or Windows should be re-assessed or potentially removed. Snapshots will most likely be generated on Mac OS in the future.

Issues to consider:

• How will this effect snapshots generated on Windows operating systems? Will this be a problem?

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Thanks for reporting 🥳!