Issue #3489416 by quietone, lavanyatalwar, shalini_jha, smustgrave, borisson_: Fix Drupal.Commenting.FunctionComment.MissingReturnComment in non-tests

Issue #3088730 by Spokje, anmolgoyal74, ankithashetty, Mile23, longwave, naresh_bavaskar, greg.1.anderson, Mixologic, klausi: Include 'composer' directory in phpcs scans

Issue #3103918 by greg.1.anderson, Mile23, alexpott, Mixologic, catch: [policy + patch] Decide on backwards compatibility policy for Composer plugins in Drupal 8

Revert "Revert "Issue #3087482 by Mile23, greg.1.anderson, AaronMcHale, johndevman, mbaynton, alexpott: Add 'next steps' info to Composer installation output""

This reverts commit 32b0bacf.

Revert "Issue #3087482 by Mile23, greg.1.anderson, AaronMcHale, johndevman, mbaynton, alexpott: Add 'next steps' info to Composer installation output"

This reverts commit b547ffe6.

Issue #3087482 by Mile23, greg.1.anderson, AaronMcHale, johndevman, mbaynton, alexpott: Add 'next steps' info to Composer installation output