test(integration): add more tags, complete embed feature tests suite, fix order with metadata

test/integration/features/pdfengines_flatten.feature

@@ -1,3 +1,6 @@
+@pdfengines
+@pdfengines-flatten
+@flatten
 Feature: /forms/pdfengines/flatten
 
   Scenario: POST /forms/pdfengines/flatten (Single PDF)
@@ -48,6 +51,7 @@ Feature: /forms/pdfengines/flatten
     Then the Gotenberg container should log the following entries:
       | "trace":"forms_pdfengines_flatten" |
 
+  @output-filename
   Scenario: POST /forms/pdfengines/flatten (Output Filename - Single PDF)
     Given I have a default Gotenberg container
     When I make a "POST" request to Gotenberg at the "/forms/pdfengines/flatten" endpoint with the following form data and header(s):
@@ -58,6 +62,7 @@ Feature: /forms/pdfengines/flatten
     Then there should be the following file(s) in the response:
       | foo.pdf |
 
+  @output-filename
   Scenario: POST /forms/pdfengines/flatten (Output Filename - Many PDFs)
     Given I have a default Gotenberg container
     When I make a "POST" request to Gotenberg at the "/forms/pdfengines/flatten" endpoint with the following form data and header(s):
@@ -71,6 +76,7 @@ Feature: /forms/pdfengines/flatten
       | page_1.pdf |
       | page_2.pdf |
 
+  @download-from
   Scenario: POST /forms/pdfengines/flatten (Download From)
     Given I have a default Gotenberg container
     Given I have a static server
@@ -81,6 +87,7 @@ Feature: /forms/pdfengines/flatten
     Then the response header "Content-Type" should be "application/pdf"
     Then the response PDF(s) should be flatten
 
+  @webhook
   Scenario: POST /forms/pdfengines/flatten (Webhook)
     Given I have a default Gotenberg container
     Given I have a webhook server