[TEST] Add parser unit tests for scapy_recon plugin malformed and edge-case output

[Nitanshu715]

Summary

The scapy_recon plugin parses live host discovery output but has no dedicated
parser test file covering malformed or edge-case input. Issue #1431 tracks this
but has had no linked PR for 12+ days.

Problem

plugins/scapy_recon/parser.py has no test coverage for:

• Empty output (no hosts discovered)
• Malformed/partial lines
• Mixed stdout with irrelevant noise
• Output with unusual whitespace or encoding

Without these tests, silent regressions in the parser can go undetected.

Proposed Fix

Add testing/unit/plugins/test_scapy_recon_parser.py covering:

• Normal output with one or more live hosts
• Empty string input
• Completely malformed input
• Lines with missing fields
• Parser does not raise exceptions on any input

Acceptance Criteria

• All edge-case inputs return a list (never crash)
• Findings from valid output are correctly structured
• Tests run with pytest in under 1 second (no real network calls)

Self-assignment

I'd like to work on this. Can I get assigned? @utksh1

[utksh1]

Closing as a duplicate of #1431, which already has an active PR (#1710) covering scapy_recon parser edge-case tests. Please follow or help review that PR rather than opening a parallel implementation.