Add backticks around stack IDs for markdown summary

[menehune23]

Summary

Adds backticks around stack IDs for markdown summaries. This is especially important for wildcard stacks (*), which would render as a sub-bullet if not made literal.

Closes #30

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
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• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).