Fix: revert AWS key identifier

What does this MR do?

Reverts aws token identifier to previous v3.14.0 value to prevent incorrect mappings between findings.

Previously description = "AWS", was changed to description = "AWS token" which fails to resolve within ScanSecurityReportSecretsWorker

I'd like to add a dedicated check for this but I'll do so in a follow-up MR. For now if the pipeline passes with the updated expectations that should be sufficient to show this was fixed.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
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• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer