build: fast-track npm PRs and dont-land them on LTS

PR-URL: #38885
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Ruy Adorno <[email protected]>
Reviewed-By: Jiawen Geng <[email protected]>

Author: targos

.github/label-pr-config.yml

@@ -78,6 +78,7 @@ subSystemLabels:
   /^deps\/v8\/tools\/gen-postmortem-metadata\.py/: V8 Engine, post-mortem
   /^deps\/v8\//: V8 Engine
   /^deps\/uvwasi\//: wasi
+  /^deps\/npm\//: npm, dont-land-on-v14.x, dont-land-on-v12.x
   /^deps\/nghttp2\/nghttp2\.gyp/: build, http2
   /^deps\/nghttp2\//: http2
   /^deps\/ngtcp2\//: quic, dont-land-on-v14.x, dont-land-on-v12.x