Remove vulnerability_location_image_filter feature flag

Changelog: removed

config/feature_flags/development/vulnerability_location_image_filter.yml

----
-name: vulnerability_location_image_filter
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69867
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/340915
-milestone: '14.4'
-type: development
-group: group::container security
-default_enabled: true

ee/app/finders/security/vulnerabilities_finder.rb

@@ -99,7 +99,7 @@ module Security
       # This filter will not work for InstanceSecurityDashboard, because InstanceSecurityDashboard could have multiple projects.
       return if vulnerable.is_a?(InstanceSecurityDashboard)
 
-      if params[:image].present? && Feature.enabled?(:vulnerability_location_image_filter, vulnerable, default_enabled: :yaml)
+      if params[:image].present?
         @vulnerabilities = vulnerabilities.with_container_image(params[:image])
       end
     end

ee/spec/finders/security/vulnerabilities_finder_spec.rb

@@ -165,19 +165,6 @@ RSpec.describe Security::VulnerabilitiesFinder do
     let(:filters) { { image: [finding.location['image']] } }
     let(:feature_enabled) { true }
 
-    before do
-      stub_feature_flags(vulnerability_location_image_filter: feature_enabled)
-    end
-
-    context 'when vulnerability_location_image_filter is disabled' do
-      let(:feature_enabled) { false }
-
-      it 'does not include cluster vulnerability' do
-        is_expected.not_to contain_exactly(cluster_vulnerability)
-      end
-    end
-
-    context 'when vulnerability_location_image_filter is enabled' do
     it 'only returns vulnerabilities matching the given image' do
       is_expected.to contain_exactly(cluster_vulnerability)
     end
@@ -189,7 +176,6 @@ RSpec.describe Security::VulnerabilitiesFinder do
         is_expected.to be_empty
       end
     end
-    end
 
     context 'when vulnerable is InstanceSecurityDashboard' do
       let(:vulnerable) { InstanceSecurityDashboard.new(project.users.first) }