Remove warning about pnpm

[NullVoxPopuli]

RFC: emberjs/rfcs#907
Implementation PR: ember-cli/ember-cli#10287
Advancement PR: emberjs/rfcs#932

• make a repo that demonstrates that the default blueprint with pnpm passes all try scenarios
  • https://github.com/NullVoxPopuli/pnpm-default-addon-demo-ember-try-remove-pnpm-warning/actions/runs/5359698497

In this more involved CI setup, having the default pnpm flags https://github.com/NullVoxPopuli/ember-data-resources/actions/runs/5365368548/jobs/9734152943 and it also works

[codecov]

Codecov Report

Merging #956 (abdfb31) into master (81c6107) will increase coverage by 0.17%.
The diff coverage is n/a.

❗ Current head abdfb31 differs from pull request most recent head 3e1d4a2. Consider uploading reports for the commit 3e1d4a2 to get more accurate results

@@            Coverage Diff             @@
##           master     #956      +/-   ##
==========================================
+ Coverage   94.37%   94.54%   +0.17%     
==========================================
  Files          17       17              
  Lines         551      550       -1     
==========================================
  Hits          520      520              
+ Misses         31       30       -1     

Impacted Files	Coverage Δ
lib/utils/dependency-manager-adapter-factory.js	91.30% <ø> (+3.80%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[kategengler]

Thank you!