Enable codecov support

[mofojed]

• Create codecov.yml, with the carryforward flag for partial reports. Already uploaded the initial full report from current main
• Add badge to readme
• Enable only on pull requests

[mattrunyon]

Will this fail ever for coverage that is too low? And are you planning to set it up w/ a bot comment/link for the report? Just the report might be fine so we can see changes and determine if we should be adding tests

[mofojed]

Yeah I forgot to remove the coverageThresholds, they're removed now.

I've requested to install the GitHub app which will supposedly comment as codecov, need authorization from Devin first to enable it. Then it should comment automatically on all PRs, with links back to things.

[mofojed]

Here's an example of a report on my repo: mofojed#1

Once authorized here it should post on here as codecov-commenter. I think the carry forward flag will work correctly once the codecov.yml is merged into main. We'll need to make sure that works.

[codecov]

Codecov Report

Merging #312 (755ddeb) into main (1a9f7fb) will decrease coverage by 39.67%.
The diff coverage is n/a.

❗ Current head 755ddeb differs from pull request most recent head db43a23. Consider uploading reports for the commit db43a23 to get more accurate results

@@            Coverage Diff            @@
##             main   #312       +/-   ##
=========================================
- Coverage   39.67%      0   -39.68%     
=========================================
  Files         328      0      -328     
  Lines       23250      0    -23250     
  Branches     4790      0     -4790     
=========================================
- Hits         9224      0     -9224     
+ Misses      13573      0    -13573     
+ Partials      453      0      -453     

Flag	Coverage Δ
unit	∅ <ø> (∅)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/chart/src/ChartModel.js
packages/file-explorer/src/FileStorage.ts
packages/components/src/DraggableItemList.tsx
packages/components/src/ButtonGroup.tsx
...ode-studio/src/styleguide/SelectValueListInput.jsx
packages/chart/src/plotly/Plot.js
packages/iris-grid/src/IrisGridModelFactory.js
packages/components/src/TimeInput.tsx
packages/components/src/RadioGroup.tsx
packages/console/src/monaco/lang/python.js
... and 318 more

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