Add flag to send certificate chain for subject name / issuer based auth in Connect-MgGraph

[nayanshah]

Fixes #2698

Changes proposed in this pull request

Adds a flag SendCertificateChain to Connect-MgGraph to send entire certificate chain while requesting access token. This allows subject name / issuer based auth.

Other links

ClientCertificateCredentialOptions.SendCertificateChain - https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity/src/Credentials/ClientCertificateCredentialOptions.cs

[timayabi2020]

I recommend that you add a pester test for the new parameter.

[nayanshah]

I don't see any test passing a real certificate or a way to mock the authentication provider, so would be difficult to write a test for the new parameter. The parameter is forwarded to ClientCertificateCredential class which doesn't expose the value as a public member, so not straightforward to add a C# unit test either.

I have updated existing pester test to include the new parameter in the appropriate parameter set. Would that be sufficient given that not much new logic is being added?

[nayanshah]

Thank you @timayabi2020 . Do you know when is the next release scheduled for?

[timayabi2020]

@nayanshah it will be out by end of this week.