Dismissed vulnerability findings don't always show as dismissed - Secret Detection

This was discovering while enabling secret detection widget in MRs in !41582 (comment 409096018). This could be a manifestation of #231003 (closed) but keeping it separate for now until further evaluation.

Bug

There seems to be a problem with dismissing/un-dismissing secret detection vulnerabilities.

POC

Dependency scanning dismissal (correct)	Secret detection dismissal (incorrect)
Peek_2020-09-08_13-44	Peek_2020-09-08_13-46