[SDK/Service] OAuthPrompt should complete with null token and error when a signin flow is cancelled

[swagatmishra2007]

Issue

Today when a bot user clicks the login button on an oauth card , the signin process involves opening a browser for login. If the user cancels this flow (by not granting consent for instance), or other failure, the flow fails in the browser and the bot is never notified. For an example see issue - https://github.com/microsoft/botframework-sdk/issues/6137

Proposed change

• Update the OAuthPrompt related contracts to support a "failure reason"
• Update service code to return the proper contract when an error happens (this should not apply to the "test connection" flow in the portal)

Component Impact

• SDK (OAuthPrompt code and contracts)
• Service update

Customer Impact

More seamless flow in case of user login failure (See referred issue above)

Tracking Status

Dotnet SDK TODO

• [ ] PR
• [ ] Merged

Javascript SDK TODO

• [ ] PR
• [ ] Merged

Python SDK TODO

• [ ] PR
• [ ] Merged

Java SDK TODO

• [ ] PR
• [ ] Merged

Samples TODO

• [ ] PR
• [ ] Merged

Docs TODO

• [ ] PR
• [ ] Merged

Tools TODO

• [ ] PR
• [ ] Merged

[swagatmishra2007]

@Jeffders @carlosscastro @stevengum @EricDahlvang thoughts?

[daveta]

Hi @swagatmishra2007, were you able to get any consensus here?

[EricDahlvang]

Looks like a good plan to me.