fix(client-certificates): reestablish a way to explicitly send no client certificate for an origin

[Florian Schwalm (egfx-notifications)]

Summary

Restores the ability to explicitly send no client certificate for an origin, fixing a regression from #41113 (first released in v1.61.0).

Details

• Adds a new sendNone option to the clientCertificates test option so we can explicitly request sending no certificate to a server rather than relying on the previous implicit "clientCertificates set, but origin not mentioned in configured origins means intercept and send no certificate"
• Adds tests to prevent a future silent regression and clarifies the docs.

Fixes #42546

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