tests: update template example test

[ianlewis]

Description:

Update the example test to include the AST.

Related Issues:

n/a

Checklist:

• Review the CONTRIBUTING.md documentation.
• Add a reference to a related issue in the repository.
• Add a description of the changes proposed in the pull request.
• Add unit tests if applicable.
• Update documentation if applicable.
• Add a note in the CHANGELOG.md if applicable.

[Copilot]

Pull request overview

This PR updates the template example test to display the AST (Abstract Syntax Tree) structure before executing the template, making the example more educational by showing both the parsed tree structure and the final output.

Changes:

• Added a String() method to tmplNode for better AST visualization
• Updated the template example to print the AST before execution
• Standardized output formatting in the infix calculator example

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
template_example_test.go	Added String() method to tmplNode and updated example to print AST structure alongside execution output
infix_example_test.go	Changed fmt.Print to fmt.Println and added blank line in expected output for consistency

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