task: #3615321 Update packaging to DSFR 1.15.1: new install method, etalab-2.0...

Mikael Meullerequested to merge
issue/ui_suite_dsfr-3615321:3615321-1.15.0-update-packaging into 1.x

task: #3615321 Update packaging to DSFR 1.15.1: new install method, etalab-2.0 license, version bump

Co-Authored-By: Claude Fable 5 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01E7QxsAV4cr7t1XF1khFojZ

Closes #3615321

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