fix: #3627193 Install the front-end theme without the core recipe removed in Drupal 12

Issue: https://www.drupal.org/project/webship_portal/issues/3627193

• Drop core/recipes/core_recommended_front_end_theme: Drupal 12 removed it (and Olivero). The template installs block and Webtheme itself and already makes Webtheme the default theme.
• Drop the block.block.olivero_help import (Olivero is gone on 12), and create the olivero_medium date format the Web Blog display uses, which used to come with that recipe.
• Contact webform: simpleConfigUpdate on a config entity throws on Drupal 12; use setProperties with dotted third_party_settings keys (works on 11).
• CI: opt in to the next-major and max-PHP jobs, with the lenient allow list for the next-major composer job.
• The views.view.products action is on a config entity too: setProperties with the same dotted key.

AI-Generated: Yes

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