chore(script): add concurrency to inactive uids script

Because:
 - the script takes a long time to run

This commit:
 - adds concurrency to the active status checks

packages/fxa-auth-server/scripts/delete-inactive-accounts/get-inactive-account-uids.ts

@@ -18,6 +18,7 @@ import { performance } from 'perf_hooks';
 import { Command } from 'commander';
 import { StatsD } from 'hot-shots';
 import { Container } from 'typedi';
+import PQueue from 'p-queue-compat';
 
 import { parseDryRun } from '../lib/args';
 import { AppConfig, AuthFirestore, AuthLogger } from '../../lib/types';
@@ -107,6 +108,11 @@ const init = async () => {
       'The number of results per accounts DB query.  Defaults to 100000.',
       parseInt
     )
+    .option(
+      '--concurrency [number]',
+      'The number inflight active checks.  Defaults to 6.',
+      parseInt
+    )
     .option('--perf-stats [true|false]', 'Print out performance stats.', false);
 
   program.parse(process.argv);
@@ -253,6 +259,10 @@ const init = async () => {
   }
 
   const fd = fs.openSync(filepath, 'a');
+  const concurrency = program.concurrency || 6;
+  const queue = new PQueue({
+    concurrency,
+  });
 
   let hasMaxResultsCount = true;
   let totalRowsReturned = 0;
@@ -271,10 +281,15 @@ const init = async () => {
 
     const inactiveUids: string[] = [];
     for (const accountRecord of accounts) {
+      await queue.onSizeLessThan(concurrency * 5);
+
+      queue.add(async () => {
         if (!(await isActive(accountRecord))) {
           inactiveUids.push(accountRecord.uid);
         }
+      });
     }
+    await queue.onIdle();
 
     if (inactiveUids.length) {
       totalInactiveAccounts += inactiveUids.length;