fix(cli): explicitly close tree-sitter cursors and ast (#8243)

Fix https://github.com/aspect-build/aspect-cli/issues/818

See also:
 smacker/go-tree-sitter#183
 smacker/go-tree-sitter#182

---

### Changes are visible to end-users: yes

- Searched for relevant documentation and updated as needed: yes
- Breaking change (forces users to change their own code or config): no
- Suggested release notes appear below: yes

Ensure `configure` tree-sitter resources are explicitly cleaned up.

### Test plan

- Covered by existing test cases

Author: jbedard

cli/core/gazelle/common/treesitter/parser.go

@@ -56,6 +56,10 @@ type AST interface {
 	// TODO: delete
 	QueryStrings(query TreeQuery, returnVar string) []string
 	RootNode() *sitter.Node
+
+	// Release all resources related to this AST.
+	// The AST is most likely no longer usable after this call.
+	Close()
 }
 type treeAst struct {
 	lang       LanguageGrammar
@@ -67,6 +71,12 @@ type treeAst struct {
 
 var _ AST = (*treeAst)(nil)
 
+func (tree *treeAst) Close() {
+	tree.sitterTree.Close()
+	tree.sitterTree = nil
+	tree.sourceCode = nil
+}
+
 func (tree *treeAst) String() string {
 	return fmt.Sprintf("treeAst{\n lang: %q,\n filePath: %q,\n AST:\n  %v\n}", tree.lang, tree.filePath, tree.sitterTree.RootNode().String())
 }

cli/core/gazelle/common/treesitter/queries.go

@@ -37,6 +37,7 @@ func (tree *treeAst) QueryStrings(query TreeQuery, returnVar string) []string {
 
 	// Execute the query.
 	qc := sitter.NewQueryCursor()
+	defer qc.Close()
 	qc.Exec(sitterQuery.q, rootNode)
 
 	// Collect string from the query results.
@@ -83,6 +84,7 @@ func (tree *treeAst) Query(query TreeQuery) <-chan ASTQueryResult {
 	// Execute the query.
 	go func() {
 		qc := sitter.NewQueryCursor()
+		defer qc.Close()
 		qc.Exec(q.q, rootNode)
 
 		for {
@@ -167,6 +169,7 @@ func (tree *treeAst) QueryErrors() []error {
 
 	// Execute the import query
 	qc := sitter.NewQueryCursor()
+	defer qc.Close()
 	qc.Exec(query.q, node)
 
 	// Collect import statements from the query results

cli/pro/gazelle/host/queries/ast.go

@@ -11,6 +11,7 @@ func runPluginTreeQueries(fileName string, sourceCode []byte, queries plugin.Nam
 	if err != nil {
 		return err
 	}
+	defer ast.Close()
 
 	// Parse errors. Only log them due to many false positives.
 	// TODO: what false positives? See js plugin where this is from