ci: make test/js/bun/shell/commands/rm.test.ts less flaky

[nektro]

typical times for the node_modules test range from 2713.78ms to 9518.02ms

slightly increasing the timeout length and lowering the parallelism should make this much less flaky to network conditions

[nektro]

if this fails with this remedy I'll move it to a separate file and do the install outside the test

[github-actions]

❌ @nektro, your commit has failing tests :(

💪 2 failing tests Darwin AARCH64

• test/js/bun/http/serve.test.ts 6 failing
• test/js/bun/net/socket.test.ts 1 failing

💻 3 failing tests Darwin x64 baseline

• test/cli/hot/hot.test.ts 1 failing
• test/js/bun/http/serve.test.ts 2 failing
• test/js/bun/net/socket.test.ts 1 failing

💻 4 failing tests Darwin x64

• test/cli/install/registry/bun-install-registry.test.ts 12 failing
• test/js/bun/http/serve.test.ts 5 failing
• test/js/bun/net/socket.test.ts 1 failing
• test/js/web/workers/worker.test.ts 1 failing

🐧🖥 1 failing tests Linux x64 baseline

• test/js/node/child_process/child_process-node.test.js 1 failing

🐧🖥 2 failing tests Linux x64

• test/integration/mysql2/mysql2.test.ts 2 failing
• test/js/node/child_process/child_process-node.test.js 1 failing

🪟💻 11 failing tests Windows x64 baseline

• test/cli/install/bunx.test.ts 1 failing
• test/cli/install/migration/migrate.test.ts 1 failing
• test/integration/esbuild/esbuild.test.ts 1 failing
• test/integration/next-pages/test/dev-server-ssr-100.test.ts 1 failing
• test/integration/next-pages/test/dev-server.test.ts 1 failing
• test/js/bun/http/serve.test.ts 2 failing
• test/js/bun/shell/bunshell.test.ts 1 failing
• test/js/node/dns/node-dns.test.js SIGKILL
• test/js/node/process/process.test.js 2 failing
• test/js/node/watch/fs.watchFile.test.ts 3 failing
• test/js/web/workers/worker.test.ts 2 failing

🪟💻 11 failing tests Windows x64

• test/cli/install/bunx.test.ts 1 failing
• test/cli/install/migration/migrate.test.ts 1 failing
• test/integration/next-pages/test/dev-server.test.ts 1 failing
• test/js/bun/http/serve-body-leak.test.ts 3 failing
• test/js/bun/http/serve.test.ts 2 failing
• test/js/bun/shell/bunshell.test.ts 1 failing
• test/js/node/dns/node-dns.test.js 2 failing
• test/js/node/process/process.test.js 2 failing
• test/js/node/watch/fs.watchFile.test.ts 3 failing
• test/js/web/fetch/fetch.tls.test.ts 1 failing
• test/js/web/workers/worker.test.ts 2 failing

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[Jarred-Sumner]

The cause of flakiness is bun install making external network requests that take potentially a long time.

This test isn't meant to test bun install. It's meant to test rm. So let's just not run bun install, and instead create a big folder with a bunch of files and then verify that recursively deleting the folder works.