chore(ci): cancel previous workflow runs on push

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Issue being fixed or feature implemented

Slow workflow runs can fill up the pipeline, making it necessary to manually cancel older runs. This PR adds an action to the workflow to cancel previous runs from the same branch with a different SHA.

What was done?

Add styfle/cancel-workflow-action action

How Has This Been Tested?

In CI

Breaking Changes

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have added or updated relevant unit/integration/functional/e2e tests
• [x] I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• [x] I have assigned this pull request to a milestone

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I think this is failing because we need to cherry-pick commits from v0.20-dev into master. I tried to learn how to do this, I think the procedure is to cherry-pick from v0.20-dev to master on the local machine and push? Does this look right?

git checkout master
git cherry-pick 135baeb^..44d91a8
git push