[clsi] parse env var for download concurrency as int (#31959)

GitOrigin-RevId: dbd91315318e385d691a6b59efeb3bf22f559fa2

services/clsi/config/settings.defaults.cjs

@@ -71,7 +71,8 @@ module.exports = {
 
   smokeTest: process.env.SMOKE_TEST || false,
   project_cache_length_ms: 1000 * 60 * 60 * 24,
-  parallelFileDownloads: process.env.FILESTORE_PARALLEL_FILE_DOWNLOADS || 1,
+  parallelFileDownloads:
+    parseInt(process.env.FILESTORE_PARALLEL_FILE_DOWNLOADS, 10) || 1,
   filestoreDomainOveride: process.env.FILESTORE_DOMAIN_OVERRIDE,
   texliveImageNameOveride: process.env.TEX_LIVE_IMAGE_NAME_OVERRIDE,
   texliveOpenoutAny: process.env.TEXLIVE_OPENOUT_ANY,