Follow-up from "Move first_comment_regex to instructions extractor"
Background
The following discussion from !134657 (merged) should be addressed:
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@mikolaj_wawrzyniak started a discussion: question (non-blocking): Should this threshold also take into account suffix of a file that requested code creation?
Goal
Consider taking suffix into account when deciding if default code generation instruction can be applied at https://gitlab.com/gitlab-org/gitlab/-/blob/9a831618dbb8f7509117a472d4d635ffc3125f3d/ee/lib/code_suggestions/instructions_extractor.rb#L81