Disable npm audit in CI to prevent ETIMEDOUT failures

npm 11.x runs 'npm audit' by default during 'npm ci' and treats
network failures on the security advisories endpoint as hard errors.
The AzDO feed's advisories/bulk endpoint intermittently times out,
causing build failures with exit code -1 and ETIMEDOUT.

The audit is non-essential for CI builds — we don't need to block
on checking for known vulnerabilities during every build.

Co-authored-by: Copilot <[email protected]>

Author: wtgodbe

.npmrc

@@ -1,4 +1,5 @@
 registry=https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/
+audit=false
 fetch-retries=5
 fetch-retry-factor=2
 fetch-retry-maxtimeout=120000