Refine grab command to only use numbered test servers and update help documentation

src/commands/deployment/testservers/grab/grab.ts

@@ -13,7 +13,7 @@ import { getTestStacksInfo, Stack } from '../../../../common/testservers';
 import { getIssueFromRepo } from '../../../../services/github_rest';
 const { spawn } = require('child_process');
 
-const EXCLUDED_NAMED_STACKS = ['photowall-test-ingrid', 'photowall-test-usa'];
+const TEST_STACK_NAME_PATTERN = /^photowall-test-\d+$/;
 const EXCLUDED_STATUSES = [
   'UPDATE_FAILED',
   'CREATE_FAILED',
@@ -148,7 +148,7 @@ module.exports = {
     const now = Date.now();
     const candidates: Candidate[] = [];
     for (const stack of testStacks) {
-      if (EXCLUDED_NAMED_STACKS.includes(stack.name)) continue;
+      if (!TEST_STACK_NAME_PATTERN.test(stack.name)) continue;
       if (EXCLUDED_STATUSES.includes(stack.status)) continue;
 
       const updatedTs = new Date(stack.updated).getTime();