Issue #3529874: Create `drupal_nl` config split.

Volodymyr Vavrynyukrequested to merge
issue/la_nl-3529874:3529874-create-drupal_nl-config-split into 1.0.x
  • Replaced default configs with la_eu default configs.
  • Created drupal_nl config split.
  • Extracted la_nl-specific configs into drupal_nl config split.
  • Installed missing modules.
  • Created empty la_eu_default_content module.
  • Added config-split.md doc.

Closes #3529874

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