Disable CodeCov status checks on PRs

[imnasnainaec]

https://docs.codecov.com/docs/commit-status#disabling-a-status

---

This change is 

[jmgrady]

Codecov YAML validation:

$ cat codecov.yml | curl --data-binary @- https://codecov.io/validate
Valid!

{
  "coverage": {
    "status": {
      "patch": false,
      "project": false
    }
  },
  "ignore": [
    "^src/api.*",
    "^src/backend/index.ts.*",
    "^src/resources.*",
    "^src/types.*",
    "(?s:.*/[^\\/]*Mock\\.ts.*)\\Z",
    "(?s:.*/[^\\/]*Types\\.ts.*)\\Z"
  ]
}

[jmgrady]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)