Remove bundled copy of actions extractor

[dbartol]

In #2582, I temporarily added an embedded version of the actions extractor into the CodeQL Action itself, to work around the extractor being omitted from the CLI bundle. That's been fully corrected as of CLI 2.20.4, so we should no longer need the embedded copy.

I'm ignoring the possibility of Advanced Setup users having pinned tools: to a specific version, since the Actions analysis is only in preview anyway.

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.

[dbartol]

To be safe, I checked our telemetry and there have been zero runs in the last 14 days that analyzed actions and used a CLI older than 2.20.4.

[Copilot]

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[dbartol]

🤦‍♂️ The autobuild.sh file in the extractor in the CLI doesn't have the execute bit set. I'll have to fix it in the CLI and wait for the newer version to be propagated.

[aeisenberg]

I will pick this PR up again.