Add WebReflection’s Custom Elements v0 to v1 translation layer polyfill to the workers playground

[ExE-Boss]

WebReflection’s Custom Elements v0 to v1 translation layer polyfill translates Custom Elements v0 calls to Custom Elements v1 calls, and with Firefox deciding to not implement Custom Elements v0, only v1, this polyfill is necessary to use the site in Firefox.

The other option would be to rewrite Custom Elements v0 calls to Custom Elements v1 calls.

This will have to be added to the V8 inspector located at https://cloudflareworkers.com/devtools/inspector.html

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See also https://community.cloudflare.com/t/add-webreflection-s-custom-elements-v0-to-v1-translation-layer-polyfill-to-the-workers-playground/23209

[lauragift21]

Thank you @ExE-Boss, for the issue. This is a issue about the playground which, to my knowledge lives in a different location and this templates repo has moved into the workers-sdk monorepo, here:
https://github.com/cloudflare/workers-sdk/tree/main/templates

So I'll be closing out this issue.