CrossRegionHedging: Fixes NullReference Exception Bug

[dibahlfi]

Pull Request Template

Description

This change is to fix CosmosNullReferenceException that happens when a client passes a CancellationToken along with the request. Please see(#4737) for more information.

Type of change

Please delete options that are not relevant.

• [] Bug fix (non-breaking change which fixes an issue)

Closing issues

To automatically close an issue: closes #4737

[kundadebdatta]

One minor comment. Otherwise, LGTM.

[NaluTripician]

A few nits other than that LGTM. Good work, thanks!

[sourabh1007]

We are changing the behavior here, previously if operation was cancelled due to cancellation token, it used to return a valid HedgingResponse, now we are returning exception. Is this expected?

[dibahlfi]

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