build: disable test-asan workflow

It is running on ubuntu-20.04, which will inevitably be removed from
GitHub actions at some point. Attempts to upgrade it to ubuntu-22.04
and ubuntu-24.04 have failed.

It is now blocking V8 updates because of errors that happen only with
the `test-asan` job.

Refs: nodejs#52374
Refs: nodejs#53651 (comment)

.github/workflows/test-asan.yml

@@ -38,7 +38,7 @@ permissions:
 
 jobs:
   test-asan:
-    if: github.event.pull_request.draft == false
+    if: false  # Temporarily disabled. References: https://github.com/nodejs/node/pull/52374, https://github.com/nodejs/node/pull/53651#issuecomment-2198510810
     runs-on: ubuntu-20.04
     env:
       CC: sccache clang