Aviator auto-remediation Fix

[ankit2995]

Note: These needs to go as Hotfix in dev/v3.x

Summary

This change makes Aviator auto-remediation apply source edits using the encoding declared in audit.fvdl instead of assuming UTF-8. It reuses the existing streaming FVDL parser to read source file encoding metadata, applies strict decode/encode validation, and preserves the source file’s existing line endings when writing remediated content.

https://almoctane-ams.saas.microfocus.com/ui/entity-navigation?p=206015/2001&entityType=work_item&id=2311032

fix: fcli aviator ssc apply-remediations: apply source edits using the encoding declared in audit.fvdl instead of assuming UTF-8
fix: fcli fod aviator apply-remediations: apply source edits using the encoding declared in audit.fvdl instead of assuming UTF-8