[DOCS] Update prefect gx tutorial

[discdiver]

Updates Prefect tutorial for Prefect 2.

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• Appropriate tests and docs have been updated

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Closes #8085

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[kenwade4]

Thanks so much for updating this tutorial @discdiver! I just have some minor change requests, then it should be good to merge.

[discdiver]

Thank you, @kenwade4! All changes made. Please let me know if you need anything else from me.

[kenwade4]

Thanks for making the updates!

[HaebichanGX]

Hi @discdiver, I'm Haebichan Jung from the DevRel team at GX. I've recently testing this code, and it seems like it's causing errors due to updates on our side. Specifically, we've deprecated the great_expectations init cli. We are now using FileDataContext object.

The code below needs to run after creating my_gx_project folder (in lieu of great_expectations folder that will be created from the init cli). As the current code doesn't work with current implementation of GX, would it be possible to have it updated?

from great_expectations.core.expectation_configuration import ExpectationConfiguration
import pandas as pd
import os 
from great_expectations.data_context import FileDataContext

base = os.getcwd()

path_to_empty_folder = base + "/my_gx_project/"

context = FileDataContext.create(project_root_dir=path_to_empty_folder)```

[discdiver]

Hi Haebichan Jung. Thank you. If you have working code, do you want to make the PR to your repo and merge it?