Document improved support for integration testing (#6086)
* Integration testing topic
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* Revert "Merge branch 'guardrex/integration-testing-topic' of https://github.com/aspnet/Docs into guardrex/integration-testing-topic"
This reverts commit 0c8de51aad9f1a183df400c0dc0cf84743baf445, reversing
changes made to ba5c3518ebfdd855907a751d181996cd0f7abee7.
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* Add API ref links
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* Remove preview notice
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* React to feedback
* Update sample package refs to 2.1.0
b8ee7c29a2