Reverts PR 1993

[gabog]

This PR reverts changed made in #1993.

At this moment, is not possible to return cancelled from a component dialog.

[coveralls]

Pull Request Test Coverage Report for Build 71076

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 77.061%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Builder.Dialogs/ComponentDialog.cs	12	78.16%

Totals
Change from base Build 70288:	-0.03%
Covered Lines:	4955
Relevant Lines:	6430

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.3.1

[ghost]

Do we know why this was reverted? It would be helpful if the correct reason is passed to the next step in a waterfall dialog when a Dialog in the previous step has been cancelled.

[gabog]

We reverted because it was cancelling the entire dialog stack rather than just the leaf dialog.