Add counter to onError trigger to break possible loops

[ceciliaavila]

minor

Description

This PR adds a counter in the loop that executes the onError trigger to detect and break possible infinite loops when there's an error inside the onError handler. It also includes a new property to the onError, to make the limit of executions configurable for the users (default value: 10).

Specific Changes

• Added ExecutionLimit property to the onError trigger and read it in the override of the ExecuteAsync method.
• Updated InternalRunAsync in DialogExtensions to evaluate the execution limit property and break the loop in case of detecting one.
• Added ExecutionLimit property to TurnPath to be able to store the value in memory.
• Updated Microsoft.OnError.schema and Microsoft.OnError.uischema to include the new property.
• Added 2 unit tests in ConditionalTests to cover the new functionality.

Testing

These images show the scenarios we tested with the new implementation.

[coveralls]

Pull Request Test Coverage Report for Build 387980

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.005%) to 78.177%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Builder.Dialogs/Memory/TurnPath.cs	1	0.0%
/libraries/Microsoft.Bot.Streaming/Payloads/StreamManager.cs	1	90.0%
/libraries/Microsoft.Bot.Builder.Dialogs/DialogExtensions.cs	4	95.29%
<!--	Total:	6		-->

Totals
Change from base Build 387708:	0.005%
Covered Lines:	26198
Relevant Lines:	33511

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💛 - Coveralls

[BruceHaley]

:heavy_check_mark: No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll