feat: web-worker environment build

[hi-ogawa]

• follow up to feat: add web-worker example #113

Probably this requires something similar to how we discover client/server references in rsc:

• vite-environment-examples/examples/react-server/vite.config.ts

  Lines 89 to 94 in cf6de72

  	// pre-pass to collect all server/client references
  	// by traversing server module graph and going over client boundary
  	// TODO: this causes single plugin to be reused by two react-server builds
  	manager.buildStep = "scan";
  	await builder.build(builder.environments["react-server"]!);
  	manager.buildStep = undefined;

• wip: build browser and server in parallel vite-plugins#350

todo

• worker in client
• worker in worker feat: support worker in worker #119
• parallel build

[hi-ogawa]

• test: cleanup #120
• feat: support worker in worker #119
• feat: web-worker environment build #118 👈
• main

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Merge activity

• Sep 29, 5:02 AM EDT: @hi-ogawa started a stack merge that includes this pull request via Graphite.
• Sep 29, 5:05 AM EDT: @hi-ogawa merged this pull request with Graphite.