Fix issue with inline stings. (#11907)

Inline strings in Excel files were not processed correctly.
Now fixed and test added.

(cherry picked from commit bfa52b7)

std-bits/table/src/main/java/org/enso/table/excel/xssfreader/XSSFReaderSheetXMLHandler.java

@@ -131,6 +131,7 @@ public void startElement(String uri, String localName, String qName, Attributes
           break;
         case "is": // Inline String
           isIsOpen = true;
+          value.setLength(0);
           break;
       }
     }

test/Table_Tests/src/IO/Excel_Spec.enso

@@ -1218,6 +1218,29 @@ add_specs suite_builder =
             workbook.close . should_equal Nothing
             workbook.read "Sheet1" . should_fail_with Illegal_State
 
+        group_builder.specify "should be able to read a XLSX with inline strings" <|
+            workbook = (enso_project.data / "Sales_Sample_Data.xlsx") . read
+            workbook.sheet_count . should_equal 29
+            workbook.sheet_names . should_equal ['202201', '202202', '202203', '202204', '202205', '202206', '202207', '202208', '202209', '202210', '202211', '202212', '202301', '202302', '202303', '202304', '202305', '202306', '202307', '202308', '202309', '202310', '202311', '202312', '202401', '202402', '202403', '202404', '202405']
+
+            column_names = ['TERRITORY', 'DEALSIZE', 'PRODUCTLINE', 'OrderCount', 'SALES']
+
+            first_sheet = workbook.read '202201'
+            first_sheet.column_names . should_equal column_names
+            first_sheet.at 'TERRITORY' . to_vector . should_equal ['EMEA', 'NA', 'EMEA', 'EMEA', 'EMEA', 'EMEA', 'NA', 'EMEA', 'EMEA', 'EMEA']
+            first_sheet.at 'DEALSIZE' . to_vector . should_equal ['Medium', 'Medium', 'Small', 'Small', 'Small', 'Medium', 'Small', 'Medium', 'Small', 'Medium']
+            first_sheet.at 'PRODUCTLINE' . to_vector . should_equal ['Classic Cars', 'Vintage Cars', 'Classic Cars', 'Vintage Cars', 'Trucks and Buses', 'Trains', 'Vintage Cars', 'Vintage Cars', 'Trains', 'Trucks and Buses']
+            first_sheet.at 'OrderCount' . to_vector . should_equal [7, 3, 3, 7, 2, 1, 3, 3, 1, 9]
+            first_sheet.at 'SALES' . to_vector . should_equal [34585.61, 13349.31, 6606.17, 15482.34, 2856.68, 3227.63, 5647.99, 12347.2, 1705.92, 33944.75]
+
+            last_sheet = workbook.read '202405'
+            last_sheet.column_names . should_equal column_names
+            last_sheet.at 'TERRITORY' . to_vector . should_equal ['NA', 'EMEA', 'EMEA', 'NA', 'EMEA', 'EMEA', 'NA', 'EMEA', 'EMEA', 'EMEA', 'NA', 'NA', 'EMEA', 'EMEA', 'EMEA', 'NA', 'EMEA', 'NA']
+            last_sheet.at 'DEALSIZE' . to_vector . should_equal ['Large', 'Medium', 'Small', 'Medium', 'Medium', 'Small', 'Small', 'Medium', 'Medium', 'Small', 'Medium', 'Small', 'Small', 'Small', 'Large', 'Medium', 'Large', 'Small']
+            last_sheet.at 'PRODUCTLINE' . to_vector . should_equal ['Classic Cars', 'Planes', 'Trucks and Buses', 'Classic Cars', 'Trucks and Buses', 'Vintage Cars', 'Vintage Cars', 'Classic Cars', 'Motorcycles', 'Classic Cars', 'Trucks and Buses', 'Trains', 'Planes', 'Motorcycles', 'Classic Cars', 'Trains', 'Trucks and Buses', 'Trucks and Buses']
+            last_sheet.at 'OrderCount' . to_vector . should_equal [2, 4, 2, 5, 3, 2, 1, 10, 1, 6, 3, 1, 6, 1, 3, 1, 1, 2]
+            last_sheet.at 'SALES' . to_vector . should_equal [16914.55, 17742.36, 3838.83, 22429.29, 14910.28, 3513.13, 2095.45, 46915.8, 4764.6, 8776.53, 14680.72, 1193.04, 12686.65, 2803.2, 28823.4, 3256.35, 8498.0, 4772.04]
+
         group_builder.specify "should be able to read a mixed Date and DateTime column" <|
             table = (enso_project.data / "MixedExcel.xlsx") . read ..Sheet
             table.row_count . should_equal 5