Remove feature flag to read finding evidence model

Changelog: changed
EE: true

config/feature_flags/development/read_from_vulnerability_finding_evidence.yml

----
-name: read_from_vulnerability_finding_evidence
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/79883
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/352632
-milestone: '14.8'
-type: development
-group: group::threat insights
-default_enabled: false

ee/app/models/vulnerabilities/finding.rb

@@ -291,7 +291,7 @@ module Vulnerabilities
     end
 
     def evidence
-      evidence_data = finding_evidence.present? && Feature.enabled?(:read_from_vulnerability_finding_evidence) ? finding_evidence.data : metadata.dig('evidence')
+      evidence_data = finding_evidence.present? ? finding_evidence.data : metadata.dig('evidence')
 
       return if evidence_data.nil?
 

ee/spec/models/vulnerabilities/finding_spec.rb

@@ -876,31 +876,14 @@ RSpec.describe Vulnerabilities::Finding do
       context 'with finding_evidence' do
         let(:finding_evidence) { build(:vulnerabilties_finding_evidence) }
         let(:finding) { finding_evidence.finding }
+        let(:evidence) { finding_evidence.data }
 
         before do
           finding_evidence.data[:summary] = "finding_evidence Summary"
           finding_evidence.save!
         end
 
-        context 'when the read_from_vulnerability_finding_evidence feature flag is off' do
-          let(:evidence) { finding.metadata['evidence'] }
-
-          before do
-            stub_feature_flags(read_from_vulnerability_finding_evidence: false)
-          end
-
-          include_examples 'evidence schema'
-        end
-
-        context 'when the read_from_vulnerability_finding_evidence feature flag is on' do
-          let(:evidence) { finding_evidence.data }
-
-          before do
-            stub_feature_flags(read_from_vulnerability_finding_evidence: true)
-          end
-
-          include_examples 'evidence schema'
-        end
+        include_examples 'evidence schema'
       end
     end