Replace opencv_face_detector with YuNet in js_face_recognition sample

[WanliZhong]

Please use OpenCV.js from https://github.com/opencv/opencv/pull/25430, link: https://pullrequest.opencv.org/buildbot/export/pr/25430/docs/opencv.js

• change model to YuNet
• draw face key points
• fix the threshold of face matching

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• [x] I agree to contribute to the project under Apache 2 License.
• [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• [x] The PR is proposed to the proper branch
• [ ] There is a reference to the original bug report and related work
• [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name.
• [ ] The feature is well documented and sample code can be built with the project CMake

force_builders=Custom
build_image:Docs=docs-js
build_image:Custom=javascript
buildworker:Custom=linux-1,linux-4,linux-f1