Parallelize workflows

[e-perl-NOAA]

Concisely describe what has been changed/addressed in the pull request.

The following workflows have been parallelized using the {furrr} package:

• run-ss3-with-est
• test-r4ss-with-ss3
• run-ss3-no-est (via the ss3-test-models updated R script run_from_par.R)

See successful workflows on the branch here; these were run by changing the workflow trigger to run workflows on all pushes (this was changed back to the original setting for the PR)

What tests have been done?

Where are the relevant files?

• [x] No test files are required for this pull request. -->

What tests/review still need to be done?

None.

Is there an input change for users to Stock Synthesis?

• [x] No, there was no input change. -->

Additional information (optional).

[Rick-Methot-NOAA]

Nice work!

[e-perl-NOAA]

Added one more instance where future_map could replace an apply statement in run-ss3-with-noest workflow (see successful github action run here).