Fix security report schema validation

`SAST` and `SECRET_DETECTION` report validation were failing due to
a logical error.

Changelog: fixed
EE: true

ee/lib/ee/gitlab/ci/parsers/security/validators/schema_validator.rb

@@ -8,13 +8,14 @@ module EE
             module SchemaValidator
               module Schema
                 extend ::Gitlab::Utils::Override
+
+                CE_TYPES = %i(sast secret_detection).freeze
+
                 override :root_path
                 def root_path
-                  if [:sast, :secret_detection].include?(report_type)
-                    super
-                  else
-                    File.join(__dir__, 'schemas')
-                  end
+                  return super if CE_TYPES.include?(report_type)
+
+                  File.join(__dir__, 'schemas')
                 end
               end
             end

lib/gitlab/ci/parsers/security/validators/schema_validator.rb

@@ -12,7 +12,7 @@ module Gitlab
               end
 
               def initialize(report_type)
-                @report_type = report_type
+                @report_type = report_type.to_sym
               end
 
               delegate :validate, to: :schemer

spec/lib/gitlab/ci/parsers/security/validators/schema_validator_spec.rb

@@ -6,7 +6,8 @@ RSpec.describe Gitlab::Ci::Parsers::Security::Validators::SchemaValidator do
   using RSpec::Parameterized::TableSyntax
 
   where(:report_type, :expected_errors, :valid_data) do
-    :sast | ['root is missing required keys: vulnerabilities'] | { 'version' => '10.0.0', 'vulnerabilities' => [] }
+    'sast' | ['root is missing required keys: vulnerabilities'] | { 'version' => '10.0.0', 'vulnerabilities' => [] }
+    :sast  | ['root is missing required keys: vulnerabilities'] | { 'version' => '10.0.0', 'vulnerabilities' => [] }
     :secret_detection | ['root is missing required keys: vulnerabilities'] | { 'version' => '10.0.0', 'vulnerabilities' => [] }
   end