Testsuite: Add OS extraction for Windows and macOS, fix TPL init (#8595)

## Summary of Changes

- Adds OS extraction for Windows and macOS in test script.
- Fixes TPL initialization.

Maintenance/test_handling/to_zipped_format

@@ -51,7 +51,7 @@ sub reformat_results($)
     $_ = $line;
     open (PLATFORM_INFO,">${platform}.info") or return;
     open (PLATFORM_NEW_RESULTS,">${platform}.new_results") or return;
-    my ($CGAL_VERSION,$LEDA_VERSION,$COMPILER,$OS,$TESTER_NAME,$TESTER_ADDRESS,$GMP,$MPFR,$ZLIB,$OPENGL,$BOOST,$QT,$CMAKE,$TPL) = ("-","-","-","-","-","-","-","-","-","-","-","no","TPL:");
+    my ($CGAL_VERSION,$LEDA_VERSION,$COMPILER,$OS,$TESTER_NAME,$TESTER_ADDRESS,$GMP,$MPFR,$ZLIB,$OPENGL,$BOOST,$QT,$CMAKE,$TPL) = ("-","-","-","-","-","-","-","-","-","-","-","-","no","TPL:");
     my ($LDFLAGS,$CXXFLAGS) = ("", "");
     while (! /^------/) {
         if(/^\s*$/) {

Scripts/developer_scripts/run_testsuite_with_ctest

@@ -369,6 +369,7 @@ run_test_on_platform()
   echo "TESTER_NAME ${CGAL_TESTER}" >> "$RESULT_FILE"
   echo "TESTER_ADDRESS ${TESTER_ADDRESS}" >> "$RESULT_FILE"
   echo "CGAL_TEST_PLATFORM ${PLATFORM}" >> "$RESULT_FILE"
+  grep -e "^-- Operating system: " "${CGAL_BINARY_DIR}/installation.log" >> "$RESULT_FILE"
   grep -e "^-- USING " "${CGAL_BINARY_DIR}/installation.log"|sort -u >> $RESULT_FILE
   #Use sed to get the content of DEBUG or RELEASE CXX FLAGS so that Multiconfiguration platforms do provide their CXXXFLAGS to the testsuite page (that greps USING CXXFLAGS to get info)
   sed -i -E 's/(^-- USING )(DEBUG|RELEASE) (CXXFLAGS)/\1\3/' $RESULT_FILE