chore: reduce noisy warnings in test output (#11022)

* chore: reduce noisy warnings in test output

- Suppress ExperimentalWarning and DEP0169 via --disable-warning in NODE_OPTIONS
- Fix MaxListenersExceededWarning by raising limit in StoreIndex when adding exit listeners
- Update meta-updater to generate the new _test scripts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: stop streaming pnpm subprocess output during CLI tests

Buffer stdout/stderr from execPnpm instead of writing to the parent
process in real time. Output is still included in the error message on
failure.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: pipe all subprocess output in CLI tests

Use stdio: 'pipe' for all pnpm/pnpx spawn helpers so subprocess output
is buffered instead of printed. Output is still included in error
messages on failure.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: remove duplicate @pnpm/installing.env-installer in pnpm/package.json

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: use pipe stdio in dlx and errorHandler tests

Replace stdio: 'inherit' and [null, 'pipe', 'inherit'] with 'pipe' to
prevent subprocess output from leaking into test output.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: skip maxListeners adjustment when set to unlimited (0)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

exec/lifecycle/package.json

@@ -27,7 +27,7 @@
   ],
   "scripts": {
     "lint": "eslint \"src/**/*.ts\" \"test/**/*.ts\"",
-    "_test": "cross-env NODE_OPTIONS=\"$NODE_OPTIONS --experimental-vm-modules\" jest",
+    "_test": "cross-env NODE_OPTIONS=\"$NODE_OPTIONS --experimental-vm-modules --disable-warning=ExperimentalWarning --disable-warning=DEP0169\" jest",
     "test": "pnpm run compile && pnpm run _test",
     "prepublishOnly": "pnpm run compile",
     "fix": "tslint -c tslint.json src/**/*.ts test/**/*.ts --fix",