SEC-229 | Initial Commit of Snyk Git Actions

[cypresschris]

This PR adds security controls in support of vulnerability scanning for third party packages as well as first party code.

Snyk is already implemented, but these actions bring the Cypress Tools into alignment with our vulnerability management strategy. The actions that this pull request introduces send the scan results back to the Snyk dashboard. The Snyk dashboard is then coupled with branch protection rules that dictate our levels of protection by blocking PRs where this git action fails as a check.

Once the solution is fully implemented, the failures you see on the PR related to this would prevent merges of the code to the 'develop' and 'master' branches. The exit status it failed with today indicates that there is a critical vulnerability in the code base. This PR aims to increase this type of visibility.

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