test: migrate page validate feature to identifyMethods

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>
(cherry picked from commit 1cbfa2f)

Author: vitormattos

tests/integration/features/page/validate.feature

@@ -8,7 +8,7 @@ Feature: page/validate
 
     When sending "post" to ocs "/apps/libresign/api/v1/request-signature"
       | file | {"url":"<BASE_URL>/apps/libresign/develop/pdf"} |
-      | signers | [{"identify":{"account":"admin"}}] |
+      | signers | [{"identifyMethods":[{"method":"account","value":"admin"}]}] |
       | name | document |
     And the response should have a status code 200
     And sending "get" to ocs "/apps/libresign/api/v1/file/list?details=1"