use codecov directly; change upload job so it will try to send covera…

[brenol]

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This should improve the problem that is happening in #323

[hannahhenderson]

Hi @brenol, issue #323 is officially closed, so I'm going to go ahead and close this PR.

Thank you for linking to the issue in your original PR.

[AmyScript]

@brenol If you do want to make a separate PR to use the latest codecov orb, you will also need to include in your PR a .codecov.yml or else the orb will not work and it will fail CI.