chore: update coverage thresholds

[jsjoeio]

This PR updates the coverage threshold for codecov and Jest.

It changes the threshold to 60 for Jest meaning the unit tests must hit at least 60% coverage or it will fail.

It also turns off the patch requirement for codecov. We do this because sometimes PRs touch files in minor areas that have yet to be tested resulting in the patch requirement failing even if the author increased coverage in other areas. In the future, we can turn this back on.

It also changes the range to 40-70 meaning above 70% codecov will be green, less than 40 will be red and anything in between will approach green. We do this so the badge isn't read in the README and it's a reminder that we are indeed making progress on the code coverage increase.

Read more in the codecov docs.

[jawnsy]

Seems reasonable, thanks for the comprehensive PR description!

[codecov]

Codecov Report

Merging #3832 (3b78bb2) into main (0f45152) will not change coverage.
The diff coverage is n/a.

❗ Current head 3b78bb2 differs from pull request most recent head 7ac015e. Consider uploading reports for the commit 7ac015e to get more accurate results

@@           Coverage Diff           @@
##             main    #3832   +/-   ##
=======================================
  Coverage   62.05%   62.05%           
=======================================
  Files          36       36           
  Lines        1863     1863           
  Branches      378      378           
=======================================
  Hits         1156     1156           
  Misses        601      601           
  Partials      106      106           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0f45152...7ac015e. Read the comment docs.