Remove the broken "Host" header logic for isRequestToItself

[bitterpanda63]

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

🚀 New Features

• Introduced get_trusted_hostnames helper to parse trusted hostnames from environment variable

⚡ Enhancements

• Reworked is_request_to_itself to use trusted hostnames instead of headers
• Updated find_hostname_in_context to skip trusted hostnames via new check

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