Improve location fingerprint

Use colon as other parsers do
and move path to the first place
because it's the most important item

ee/changelogs/unreleased/aling-dast-lf-with-other-parsers.yml

+---
+title: Improve DAST location fingerprints
+merge_request: 10487
+author:
+type: changed

ee/lib/gitlab/ci/parsers/security/dast.rb

@@ -46,7 +46,7 @@ module Gitlab
           end
 
           def generate_location_fingerprint(location)
-            Digest::SHA1.hexdigest("#{location['param']} #{location['method']} #{location['path']}")
+            Digest::SHA1.hexdigest("#{location['path']}:#{location['param']}:#{location['method']}")
           end
         end
       end

ee/spec/lib/gitlab/ci/parsers/security/dast_spec.rb

@@ -24,8 +24,8 @@ describe Gitlab::Ci::Parsers::Security::Dast do
     end
 
     it 'generates expected location fingerprint' do
-      expected1 = Digest::SHA1.hexdigest('X-Content-Type-Options GET ')
-      expected2 = Digest::SHA1.hexdigest('X-Content-Type-Options GET /')
+      expected1 = Digest::SHA1.hexdigest(':X-Content-Type-Options:GET')
+      expected2 = Digest::SHA1.hexdigest('/:X-Content-Type-Options:GET')
 
       expect(report.occurrences.first[:location_fingerprint]).to eq(expected1)
       expect(report.occurrences.last[:location_fingerprint]).to eq(expected2)