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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[Yury Semikhatsky (yury-s)]

The name reads oddly next to the other options, how about noCertificate?

[Yury Semikhatsky (yury-s)]

revert this part, it only increases duplication

[github-actions]

Test results for "tests 1"

6 flaky

⚠️ [chromium-library] › library/chromium/chromium.spec.ts:436 › should produce network events, routing, and annotations for Service Worker (advanced) `@frozen-time-library-chromium-linux`
⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@frozen-time-library-chromium-linux`
⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@realtime-time-library-chromium-linux`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:436 › should produce network events, routing, and annotations for Service Worker (advanced) `@chromium-ubuntu-22.04-node22`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-ubuntu-22.04-node20`

51358 passed, 1247 skipped

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Merge workflow run.

[github-actions]

Test results for "MCP"

8301 passed, 1371 skipped

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Merge workflow run.