Add many-to-many form Hurl workflow

Author: lovasoa

examples/modeling a many to many relationship with a form/test.hurl

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+GET http://localhost:8080/
+HTTP 200
+[Asserts]
+body contains "Recent blog posts"
+body contains "Write a post !"
+body not contains "An error occurred"
+
+GET http://localhost:8080/write.sql
+HTTP 200
+[Asserts]
+body contains "Title of the post"
+body contains "Main Topic"
+body contains "Technology"
+body contains "Travel"
+body not contains "An error occurred"
+
+POST http://localhost:8080/write_submit.sql
+Content-Type: application/x-www-form-urlencoded
+`Title=Hurl%20many-to-many%20post&Content=Hurl%20content%20for%20the%20many-to-many%20form.&Main%20Topic=1&Topics%5B%5D=2&Topics%5B%5D=3`
+HTTP 302
+[Captures]
+location: header "Location"
+[Asserts]
+header "Location" matches "^post\\.sql\\?id=\\d+$"
+
+GET http://localhost:8080/{{location}}
+HTTP 200
+[Asserts]
+body contains "Hurl content for the many-to-many form."
+body contains "Technology"
+body contains "Travel"
+body contains "Food"
+body not contains "An error occurred"