[#6616] Telemetry not logging ActivityID and ConversationID

[erquirogasw]

Fixes #6616

Description

This PR adds ActivityID and ConversationID properties to telemetry when using the Direct Line Service App extension.

Specific Changes

• Added ActivityIdProperty property in TelemetryConstants class.
• Added ActivityID and ConversationID properties in the Fill methods in TelemetryLoggerMiddleware class.
• Updated unit tests in TelemetryMiddlewareTests.

Testing

The following images show the properties logged in Application Insights and the unit tests passing.

[coveralls]

Pull Request Test Coverage Report for Build 348112

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 25 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.02%) to 79.082%

---

Files with Coverage Reduction	New Missed Lines	%
/libraries/AdaptiveExpressions/BuiltinFunctions/GetNextViableTime.cs	1	90.91%
/libraries/AdaptiveExpressions/BuiltinFunctions/GetPreviousViableTime.cs	1	90.91%
/libraries/Microsoft.Bot.Streaming/Payloads/StreamManager.cs	1	90.0%
/libraries/Microsoft.Bot.Builder/TelemetryLoggerMiddleware.cs	22	71.24%

Totals
Change from base Build 344537:	-0.02%
Covered Lines:	25813
Relevant Lines:	32641

---

💛 - Coveralls

[BruceHaley]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll