Use embedded actions extractor only for old CLI versions

[dbartol]

When trying to remove the embedded actions extractor, we discovered that the extractor in the actual CLI download is missing the execute bit on its scripts. That's fixed in 2.20.6, so I've changed the Action to only use the embedded extractor for pre-2.20.6 versions.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

[Copilot]

PR Overview

This PR updates the logic to use the embedded actions extractor only for CLI versions prior to 2.20.6.

• Updates conditional logic based on the CodeQL version
• Includes detailed inline comments explaining the rationale for maintaining the embedded extractor for older versions

Reviewed Changes

File	Description
src/codeql.ts	Modified conditional check to use the embedded extractor only for pre-2.20.6 versions

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[angelapwen]

Makes sense to me 👍 do we want to add a changenote for this or are we skipping it because it's experimental?

[dbartol]

do we want to add a changenote for this

For this change, there should be no user-visible impact, so I'm skipping the change note. When we do finally remove the embedded extractor entirely, I'll add a change note, although we don't expect any users to actually notice the breaking change.

[angelapwen]

Sounds good to me!! 🚢