Script of gallery flow

docs/gallery/data_testing/data_testing_flow.py

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+### INTRO
+
+# This is an example flow to showcase data testing.
+
+# The flow is packed with comments to guide you through what's happening.
+# The flow is also runnable. To run it:
+# - Make a virtual environment with the requirements.txt that live in the same
+#   folder as this script.
+# - Start a shell, activate the venv, login to AWS and turn on your Mercadão
+#   VPN.
+# - In the shell, run the command: TODO
+#
+# Note: this flow is designed to run in your laptop. It won't work in the
+# prefect server. Don't bother uploading it.
+
+# The flow connects to DW and makes a silly check on a silly query. You can use
+# it as a reference on how to set up a data test in your serious flows.
+
+
+### IMPORTS
+
+# TODO
+
+### TASK PREP
+
+# TODO
+
+### FLOW
+
+# TODO