Add -u alias to bun test

[silverwind]

Fixes: #10073

What does this PR do?

Add -u alias to bun test as an alias to --update-snapshots

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

Compiled it and ran bun test -u against a project.

It seems there are no tests for --update-snapshot so I did not bother writing them and am also not willing to.

[Mrgaton]

i like it

[github-actions]

❌ @Jarred-Sumner, your commit has failing tests :(

💻 1 failing tests Darwin x64 baseline

• test/js/web/workers/worker.test.ts 1 failing

🪟💻 3 failing tests Windows x64 baseline

• test/cli/install/registry/bun-install-registry.test.ts 1 failing
• test/js/node/child_process/child_process.test.ts 1 failing
• test/js/node/worker_threads/worker_threads.test.ts STATUS_SEVERITY_ERROR

🪟💻 3 failing tests Windows x64

• test/cli/install/bun-workspaces.test.ts SIGKILL
• test/cli/install/registry/bun-install-registry.test.ts 1 failing
• test/js/node/child_process/child_process.test.ts 1 failing

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