Remove warning about pnpm

[NullVoxPopuli]

RFC: https://github.com/emberjs/rfcs/pull/907 Implementation PR: https://github.com/ember-cli/ember-cli/pull/10287 Advancement PR: https://github.com/emberjs/rfcs/pull/932

• [x] 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[bot]]

Codecov Report

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

:exclamation: 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%)	:arrow_up:

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[kategengler]

Thank you!