fix: [#6792] Composer Bot with QnA Intent recognized triggers duplicate QnA queries

[sw-joelmut]

Fixes #6792

Description

This PR fixes an issue where QnA traces and requests to the CQA service were duplicated.
This issue was related to how the QnA Intent recognized trigger is structured, it contains a TextInput and an Emit Custom Event. Both actions emit an "activityReceived" event, the first when an activity is received as a prompt response, and the second on purpose, which both execute the "recognized" functionality that triggers the duplication.

Specific Changes

• Updated AdaptiveDialog to avoid reprocessing recognized activities by adding a condition if the recognized event was already processed.
• Added unit tests to validate the new condition works.

Testing

The following image shows how it emits the double trace, and how it behaves after the fix.

[coveralls]

Pull Request Test Coverage Report for Build 389235

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 61 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.009%) to 78.166%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/AdaptiveExpressions/LRUCache.cs	4	87.18%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/AdaptiveDialog.cs	57	88.72%

Totals
Change from base Build 389234:	-0.009%
Covered Lines:	26184
Relevant Lines:	33498

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💛 - Coveralls