Add test for ServiceWorkerContainer.register() from a Worker context. #50018
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See https://w3c.github.io/ServiceWorker/#serviceworkercontainer-interface
Calling ServiceWorkerContainer.register() from a Window context is already covered by worker-constructor.html.
This commit covers the case when it's called from a Worker context, more specifically particular dedicated, shared and service workers.
This passes in Firefox with the patch from
https://bugzilla.mozilla.org/show_bug.cgi?id=1940044 and https://bugzilla.mozilla.org/show_bug.cgi?id=1901492.