fix(shell): remove unecessary allocations when printing errors

[DonIsaac]

What does this PR do?

Removes some unnecessary allocations that were occurring when formatting and printing shell errors.

How did you verify your code works?

Current tests will cover these changes.

[robobun]

^{Updated 2:05 PM PT - Mar 4th, 2025}

❌ @DonIsaac, your commit 1f7d64c has 3 failures in Build #12659:

• test/js/bun/http/serve-body-leak.test.ts - 5 failing on 🐧 3.20 x64-baseline
• test/cli/install/bun-install-registry.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🪟 2019 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🍎 14 aarch64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🍎 13 aarch64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 3.20 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 3.20 aarch64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 3.20 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🍎 13 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🍎 14 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 12 aarch64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 22.04 aarch64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 20.04 aarch64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 22.04 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 24.04 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 20.04 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 12 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 24.04 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 20.04 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 12 x64
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 22.04 x64-baseline
• test/js/third_party/stripe/stripe.test.ts - 1 failing on 🐧 24.04 aarch64

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🧪   try this PR locally:

bunx bun-pr 17898