fix(CLI Tool): #3591717 Flat named component validation in @drupal-canvas/eslint-config misses sibling entrypoints

Bálint Klérirequested to merge
issue/canvas-3591717:3591717-flat-named-component-eslint-entrypoints into 1.x
  • Detect every active flat named component entrypoint in @drupal-canvas/eslint-config.
  • Keep named metadata precedence aligned with component discovery.
  • Add regression coverage for sibling flat entrypoints and explicit entrypoint imports.

Closes #3591717. Authored with an AI coding agent.

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