Add specs for code search using special chars

What does this MR do and why?

Related to #350851 (closed)

Refactor code search specs for searches with special characters to:

• Use table syntax
• Add new search examples collected from customer and support reports
• Have a supported context for known working specs
• Have an unsupported context for known issues

This change will enable easier testing when optimizing code searches that contain special characters.

Screenshots or screen recordings

N/A

How to set up and validate locally

Run the specs, the quarantined specs all fail (see !92375 (comment 1026738198))

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.