Fix svcutil endpoint configurations generation

[petarpetrovt]

Fixes #4828

• CertificateOverTransport
• IssuedTokenOverTransport - Not sure how IssuedSecurityTokenParameters parameter should be generated.
• KerberosOverTransport
• SspiNegotiatedOverTransport - Not sure how requireCancellation parameter should be generated.
• UserNameOverTransport

[HongGit]

@petarpetrovt can you please rebase and submit changes to fix the build pipeline issue?

What is your plan for the two unchecked items?

[mos379]

Anyone till looking into this?

[petarpetrovt]

@mos379 nah, feel free to take it :)

[mconnew]

@imcarolwang, can you look at the changes here and see if we're still missing what this change adds? If we are still missing this, can you validate that these changes do the right thing?

[imcarolwang]

We're still missing the changes addressed in this PR, the tool's existing implementation hard code to generate UserNameOverTransportBindingElement when configuring TransportSecurityBindingElement for CustomBinding . This PR generally includes the necessary changes to resolve the issue.

Regarding the unchecked checkbox items mentioned by the author in the PR description, PR #5789 was created attempting to address this. The new PR incorporates all the existing changes from this PR, along with added test cases.