update templates CI workflow to use built templates

[holic]

the templates workflow currently uses templates from their source with linked/workspace deps:
https://github.com/latticexyz/mud/blob/main/.github/workflows/templates.yml

ideally it should use the template output from pnpm create mud to mimic what users will see

hoping this will catch things like #3480 which the current workflow didn't catch

[holic]

we should prob combine this with the template tests in create-mud's package:

mud/packages/create-mud/package.json

Lines 24 to 28 in a743b80

	"test:phaser": "bin/cli.js --name test-project --template phaser && pnpm --dir test-project install && shx rm -rf test-project",
	"test:react": "bin/cli.js --name test-project --template react && pnpm --dir test-project install && shx rm -rf test-project",
	"test:react-ecs": "bin/cli.js --name test-project --template react-ecs && pnpm --dir test-project install && shx rm -rf test-project",
	"test:threejs": "bin/cli.js --name test-project --template threejs && pnpm --dir test-project install && shx rm -rf test-project",
	"test:vanilla": "bin/cli.js --name test-project --template vanilla && pnpm --dir test-project install && shx rm -rf test-project"

maybe we can move all this into vitest instead of github action + npm scripts