Add first_name/last_name concat matching to org_vips body/subject rules

[IndiaAce]

Description

Add alternative name matching logic to org_vips body/subject/HTML-based rules to handle cases where
display_name is stored as "Lastname, Firstname" instead of "Firstname Lastname".
Uses strings.concat(.first_name, " ", .last_name) and strings.concat(.last_name, ", ", .first_name)
as additional or conditions inside existing any($org_vips, ...) blocks.

This is a test rule deployment to assess impact magnitude.

Affected rules

• vip_impersonation_charity.yml
• fake_thread_suspicious_indicators.yml
• vip_impersonation_subject.yml
• vip_impersonation_fake_thread.yml
• impersonation_google_groups_suspicious.yml
• service_abuse_trello_board_invite_vip.yml

Associated samples

N/A - validation only (no TP canonical available)

Associated hunts

TBD - will be run after test rule deployment