Fix http scheme evaluation and removed origin from evaluation

[pavan-traceable]

Description

HTTP Scheme Evaluation Logic

This change refines the logic to determine the HTTP scheme (http or https) from an event by evaluating relevant attributes in a prioritized manner:

1. If a full URL (e.g., http.url) is present and contains https, it is returned immediately.
2. If the URL exists but has a non-https scheme (e.g., http), headers like x-forwarded-proto, forwarded, or http.scheme are checked. If any of these indicate https, it is preferred and returned.
3. If no https scheme is found, the scheme from the URL (typically http) is returned as a fallback.
4. If no URL is available, the scheme is derived from the above-mentioned headers alone.

Note: This change also removes scheme evaluation based on origin header attribute which exists previously