Add manual test for #5084

tests/plugins/tabletools/manual/cellpropertiescelltype.html

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+<h1>Editor 1:</h1>
+<div id="editor">
+	<table border="1">
+		<tbody>
+			<tr>
+				<td>Cell 1</td>
+				<td>Cell 2</td>
+			</tr>
+			<tr>
+				<td>Cell 3</td>
+				<td>Cell 4</td>
+			</tr>
+		</tbody>
+	</table>
+</div>
+
+<script>
+	CKEDITOR.replace( 'editor' );
+</script>

tests/plugins/tabletools/manual/cellpropertiescelltype.md

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+@bender-tags: 4.20.0, 5084, feature
+@bender-ui: collapsed
+@bender-ckeditor-plugins: wysiwygarea, toolbar, table, tabletools
+
+**Note:** Please verify cell structure via toggling `Source` mode.
+
+1. Right click at any cell, and select `Cell` -> `Cell Properties`.
+
+**Expected** Cell has `Data` type.
+
+2. Change cell type to `Column Header`.
+
+**Expected** Cell has `th` type and `scope` attribute set on `col`.
+
+3. Right click at any cell, and select `Cell` -> `Cell Properties`.
+
+**Expected** Cell has `Column Header` type.
+
+4. Change cell type to `Row Header`.
+
+**Expected** Cell has `th` type and `scope` attribute set on `row`.
+
+5. Right click at any cell, and select `Cell` -> `Cell Properties`.
+
+**Expected** Cell has `Row Header` type.
+
+6. Change cell type to `Data`.
+
+**Expected** Cell has `td` type and do not have `scope` attribute.
+
+7. Play with cell types and verify if they type matches expectations from the above.