Update existing feedback using `SecurityFindingDismiss` mutation

Subashis Chakrabortyrequested to merge
391463-update-feedback-comment into master

This MR creates the ability to update existing feedback with comment from SecurityFindingDismiss mutation. This is needed to avoid data inconsistency incase of disabling the FF for feedback deprecation.

Related to #391463 (closed)

Edited by Subashis Chakraborty

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