Move pnpm onlyBuiltDependencies to pnpm-workspace.yaml

pnpm 11 no longer reads the "pnpm" field from package.json and warns
"The 'pnpm' field in package.json is no longer read by pnpm." Because
unrs-resolver's build script was no longer approved, pnpm 11 treated the
ignored build as fatal (ERR_PNPM_IGNORED_BUILDS) and failed the install.

Move the setting to pnpm-workspace.yaml (pnpm 11's new home for it) and
drop the now-dead pnpm field from package.json.

Author: donnchawp

tests/e2e/package.json

@@ -11,11 +11,6 @@
 		"test:run": "jest --runInBand",
 		"typecheck": "tsgo --noEmit"
 	},
-	"pnpm": {
-		"onlyBuiltDependencies": [
-			"unrs-resolver"
-		]
-	},
 	"devDependencies": {
 		"@jest/globals": "^30.0.0",
 		"@types/node": "^24.12.0",

tests/e2e/pnpm-workspace.yaml

@@ -0,0 +1,2 @@
+onlyBuiltDependencies:
+  - unrs-resolver