feat: CAMWEBPLAT-211 Removing migrations we don't need

cambridge_migration_config/config/install/migrate_plus.migration.upgrade_d7_node_settings.yml

-langcode: en
-status: true
-dependencies: {  }
-id: upgrade_d7_node_settings
-class: Drupal\migrate\Plugin\Migration
-field_plugin_method: null
-cck_plugin_method: null
-migration_tags:
-  - 'Drupal 7'
-  - Configuration
-migration_group: migrate_drupal_7
-label: 'Node configuration'
-source:
-  plugin: variable
-  variables:
-    - node_admin_theme
-  source_module: node
-process:
-  use_admin_theme:
-    -
-      plugin: get
-      source: node_admin_theme
-destination:
-  plugin: config
-  config_name: node.settings
-migration_dependencies:
-  required: {  }
-  optional: {  }