update all remaining code blocks to use new programming expression syntax

[Hamms]

Pass 2: The Rest

Follow-up to #39839

Looks like we actually got nearly everything in the "easy stuff" pass! All that was left were a handful of console.log expressions in CSP Unit 7, which I manually updated.

All remaining instances of inline code syntax in lesson plans appear to be just plaintext code examples and - much more commonly - text occurring in between code examples, as you expect to see when using a basic regex to match something like `*`

PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked