Add tdd_dublin_test sub-module

tests/modules/tdd_dublin_test/config/optional/node.type.article.yml

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+langcode: en
+status: true
+dependencies: {  }
+name: Article
+type: article
+description: 'Use <em>articles</em> for time-sensitive content like news, press releases or blog posts.'
+help: ''
+new_revision: true
+preview_mode: 1
+display_submitted: true

tests/modules/tdd_dublin_test/config/optional/node.type.page.yml

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+langcode: en
+status: true
+dependencies: {  }
+_core:
+  default_config_hash: KuyA4NHPXcmKAjRtwa0vQc2ZcyrUJy6IlS2TAyMNRbc
+name: 'Basic page'
+type: page
+description: 'Use <em>basic pages</em> for your static content, such as an ''About us'' page.'
+help: ''
+new_revision: true
+preview_mode: 1
+display_submitted: false

tests/modules/tdd_dublin_test/tdd_dublin_test.info.yml

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+name: TDD Dublin Test
+type: module
+core: 8.x
+dependencies:
+  - tdd_dublin:tdd_dublin
+hidden: true