Issue #3597964: Add Drupal 12 compatibility

Kieran Cottrequested to merge
issue/eu_cookie_compliance-3597964:3597964-drupal-12-compatability into 8.x-1.x

Adds Drupal 12 compatibility updates.

Summary:

  • Replaces direct deprecated/removed API usages with Drupal 12-compatible service/enum paths.
    • Provides fallback behaviour for older core versions.
  • Removes hard static references to optional Smart IP and Domain classes.
  • Updates the D7 migration source away from deprecated DrupalSqlBase.
  • Fixes strict return type and test property visibility issues reported by Upgrade Status.

Closes #3597964

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