Fix various code coverage issues

[jagerber48]

There are a number of issues with the existing codecov configuration that lead to frustrations during unrelated PRs

• The main issue is the minor code coverage changes are resulting in distracting red X's showing up on PRs that should otherwise go through quickly. There are a number of causes for this
• An invalid .codecov.yaml file makes it so that configuration meant to loosen test failing conditions
• Codecov can be made to be purely information so that it never generates red X's
• The codecov secret token was made publicly available in the source code
• No flags on distinct uploads