fix(codecov): merge coverage for a single upload by workflow #1190
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It appears that the retry system introduced in #1186 was not sufficient, as we still hit API limits when running multiple checks concurrently.
This PR merges all coverage files into a single upload. As a result, we now have 3 uploads instead of 16, which should drastically reduce the number of Codecov upload failures.
Note: It still appears to fail randomly, but we might need to wait some time until our API rate decreases. I believe it's still preferable to have 3 uploads rather than 16, which seemed to overwhelm Codecov.