chore: replace mocha-only-detector with mocha/no-exclusive-tests rule

[makepanic]

It's now using the no-exclusive-tests eslint rule

fixes #6109

[makepanic]

I think yarn sorted the packages/-build-infra/package.json dependencies after running yarn remove 🤔

[rwjblue]

Looks like ember-resource-metadata failed CI, not sure why (not much info in the logs).

yarn run v1.15.2
$ ./bin/test-external-partner-project.js ember-resource-metadata https://github.com/ef4/ember-resource-metadata.git
Preparing to test external project ember-resource-metadata located at https://github.com/ef4/ember-resource-metadata.git against this ember-data commit.
/Users/vsts/agent/2.150.3/work/1/s/bin/test-external-partner-project.js:70
  throw new Error(
  ^

Error: Install of https://github.com/ef4/ember-resource-metadata.git in /Users/vsts/agent/2.150.3/work/1/__external-test-cache/ember-resource-metadata for external project ember-resource-metadata testing failed.
    at Object.<anonymous> (/Users/vsts/agent/2.150.3/work/1/s/bin/test-external-partner-project.js:70:9)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
##[error]Bash exited with code '1'.