feat(amazonq): Add @Code context for PHP, Ruby, Scala, Shell, and Swift

[avi-alpert]

Problem

Users can't add @Code context from PHP, Ruby, Scala, Shell, and Swift files

Solution

Add support for adding @Code context for PHP, Ruby, Scala, Shell, and Swift

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• Treat all work as PUBLIC. Private feature/x branches will not be squash-merged at release time.
• Your code changes must meet the guidelines in CONTRIBUTING.md.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.