Ensure that flake8 runs on PR changes

Unfortunately, the way we previously set up our workflow caused flake8
to run on code already committed to master, not the changes made in a
PR, because it ran in the context of the target branch.

This is obviously useless when it comes to protecting our codebase from
linting errors. I've now set up flake8 in a different way, using
Workflow Commands to create error annotions.

I've also split up the workflow into two separate workflows.

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