[Bug]v1 lockfile patterns issue with "@xxx/xxx" packages in Taobao registry

[wuyiw]

Describe the bug

In LegacyMigrationResolver.ts pattern for custom registries like Taobao is:

berry/packages/yarnpkg-core/sources/LegacyMigrationResolver.ts

Lines 21 to 22 in 6b9df77

	// Note: /download/ is used by custom registries like Taobao
	[/^https?:\/\/[^/]+\/(?:[^/]+\/)*(?:@[^/]+\/)?([^/]+)\/(?:-|download)\/\1-[^/]+\.tgz(?:#|$)/, version => `npm:${version}`],

this pattern fails to match packages like @types/chrome with the link:
https://registry.npm.taobao.org/@types/chrome/download/@types/chrome-0.0.51.tgz#173174baf8e801fe51d1d07e58c11044c74d2b8c
because @types is put in a non-capturing group hence not referenced later when it should be.

Environment:

• Yarn version 2.4.0