fix: relativize source root path before applying exclusion filter

excludeSourceRoot matched patterns against the full absolute path, so
projects stored under a directory containing "src/test/resources" (e.g.
test fixtures in src/test/resources/) had their source roots wronglyexcluded, producing an empty symbol table.

Fix by relativizing the source root against the project root before
pattern matching, so only path segments within the target project are
considered.

Author: sinha108

src/main/java/com/ibm/cldk/SymbolTable.java

@@ -1162,9 +1162,10 @@ private static String resolveType(Type type) {
             Paths.get("src", "it", "resources").toString(),
             Paths.get("src", "xdocs-examples").toString()
     };
-    private static boolean excludeSourceRoot(Path sourceRoot) {
+    private static boolean excludeSourceRoot(Path sourceRoot, Path projectRootPath) {
+        Path relativeSourceRoot = projectRootPath.toAbsolutePath().relativize(sourceRoot.toAbsolutePath());
         for (String excludedSrcRoot : EXCLUDED_SOURCE_ROOTS) {
-            if (Pattern.compile(excludedSrcRoot).matcher(sourceRoot.toString()).find()) {
+            if (Pattern.compile(excludedSrcRoot).matcher(relativeSourceRoot.toString()).find()) {
                 return true;
             }
         }
@@ -1202,7 +1203,7 @@ public static Pair<Map<String, JavaCompilationUnit>, Map<String, List<Problem>>>
         Map<String, JavaCompilationUnit> symbolTable = new LinkedHashMap<>();
         Map<String, List<Problem>> parseProblems = new HashMap<>();
         for (SourceRoot sourceRoot : projectRoot.getSourceRoots()) {
-            if (excludeSourceRoot(sourceRoot.getRoot())) {
+            if (excludeSourceRoot(sourceRoot.getRoot(), projectRootPath)) {
                 continue;
             }
             sourceRoot.setParserConfiguration(config);