[TEST] Add `-Pdev` to the TESTING.asciidoc guide

TESTING.asciidoc

@@ -283,3 +283,9 @@ To disable validation step (forbidden API or `// NOCOMMIT`) use
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 mvn test -Dvalidate.skip=true
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+
+You can also skip this by using the "dev" profile:
+
+---------------------------------------------------------------------------
+mvn test -Pdev
+---------------------------------------------------------------------------