[TASK] Add incomplete tests for warning in MarkDown

references: 1089

Author: linawolf

tests/Integration/tests/markdown/warning-md/expected/index.html

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+<!-- content start -->
+<h1>Sample Markdown Document</h1>
+<blockquote>
+    <blockquote>
+        <p>⚠️ <strong>TYPO3 12 compatibility</strong><br>
+            See <a href="https://www.example.com/eap">EAP page</a> for more information how to get access to a TYPO3 12 version</p>
+    </blockquote>
+</blockquote>
+<!-- content end -->

tests/Integration/tests/markdown/warning-md/input/guides.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<guides xmlns="https://www.phpdoc.org/guides"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="https://www.phpdoc.org/guides packages/guides-cli/resources/schema/guides.xsd"
+        input-format="md"
+>
+</guides>

tests/Integration/tests/markdown/warning-md/input/index.md

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+# Sample Markdown Document
+
+> :warning: **TYPO3 12 compatibility**\
+> See [EAP page](https://www.example.com/eap) for more information how to get access to a TYPO3 12 version