Change feature flag to ci_disable_validates_dependencies to enable it as default

app/models/ci/build.rb

@@ -143,7 +143,7 @@ module Ci
       end
       before_transition any => [:running] do |build|
-        build.validates_dependencies! if Feature.enabled?('ci_validates_dependencies')
+        build.validates_dependencies! unless Feature.enabled?('ci_disable_validates_dependencies')
       end
     end

spec/models/ci/build_spec.rb

@@ -1870,7 +1870,7 @@ describe Ci::Build do
   describe 'state transition: any => [:running]' do
     before do
-      stub_feature_flags(ci_validates_dependencies: true)
+      stub_feature_flags(ci_disable_validates_dependencies: true)
     end
     let(:build) { create(:ci_build, :pending, pipeline: pipeline, stage_idx: 1, options: options) }

spec/services/ci/register_job_service_spec.rb

@@ -278,7 +278,7 @@ module Ci
       context 'when "dependencies" keyword is specified' do
         before do
-          stub_feature_flags(ci_validates_dependencies: true)
+          stub_feature_flags(ci_disable_validates_dependencies: false)
         end
         let!(:pre_stage_job) { create(:ci_build, :success, pipeline: pipeline, name: job_name, stage_idx: 0) }