Upgrade postgres version, update names of workflows and update checkout action to V3

[mbh329]

motivations

• resolves issue #636
• Update and standardize Github workflow's
• Create more descriptive names for Github Actions

changes

• Update and standardize Github workflow's to Postgres 12.3 and update checkout to v3 documentation
• Create more descriptive names for Github Actions

notes

• Here are the successful (test) runs

todo

• I think it is safe to remove the corr_checker.yml file as this workflow hasn't been run recently and we ingest corrections using our standard manual corrections processes. I am happy to remove this for the sake of repo clean up but will wait for comments.
• There's probably some more work that could be done to clean this repo up but I think just updating the Github Actions workflows is a great first step and sticks to our initial plan of maintenance tasks

[mbh329]

@damonmcc I don't know if I am mentally ready to delete dev (it was helpful when we were going through enhancements) lol. I can merge dev into main and then change the default branch to be main though