feat(datasource/npm): default cacheHardTtlMinutes to 24 hours (#20079)

Renovate will now use "soft" expiry of npm datasource lookups, combined with a hard expiry of 24 hours. Soft expired results are used to improve
performance plus can be reused in case npmjs errors on subsequent lookups

lib/config/options/index.ts

@@ -2258,9 +2258,8 @@ const options: RenovateOptions[] = [
       'Maximum duration in minutes to keep datasource cache entries.',
     type: 'integer',
     stage: 'repository',
-    default: 0,
+    default: 24 * 60,
     globalOnly: true,
-    experimental: true,
   },
   {
     name: 'prBodyDefinitions',