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Revert tutorial changes for solid invocation, make testing docs around solid…

Description

Revert tutorial changes for solid invocation, make testing docs around solid invocation experimental

Summary: Solid invocation is still undergoing active development / changes, so we should keep it experimental for now. As a result, we have to make sure not to introduce a docs regression. Rolling back tutorial updates for now until invocation is in a more stable state.

Test Plan:
unit tests + test build:

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Reviewers: sandyryza, yuhan

Reviewed By: yuhan

Differential Revision: https://dagster.phacility.com/D8147