fix(S3) if the part is too small and is not ended wait for more data before sending

[cirospaciari]

What does this PR do?

Fix: #16452

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

How did you verify your code works?

Test

[robobun]

^{Updated 7:26 PM PT - Jan 16th, 2025}

❌ @cirospaciari, your commit f00eebb has 2 failures in #9857:

• test/js/web/fetch/fetch.test.ts - 1 failing on 🍎 13 aarch64
• test/js/bun/s3/s3.test.ts - code STATUS_SEVERITY_ERROR on 🪟 2019 x64
• test/js/bun/s3/s3.test.ts - code STATUS_SEVERITY_ERROR on 🪟 2019 x64-baseline
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 12 aarch64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 20.04 aarch64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 22.04 aarch64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 24.04 aarch64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 3.20 aarch64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 12 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 24.04 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 22.04 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 20.04 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 12 x64-baseline
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 22.04 x64-baseline
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 24.04 x64-baseline
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 20.04 x64-baseline
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 3.20 x64-baseline
• test/js/bun/s3/s3.test.ts - segmentation fault on 🐧 3.20 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🍎 14 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🍎 13 x64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🍎 14 aarch64
• test/js/bun/s3/s3.test.ts - segmentation fault on 🍎 13 aarch64

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🧪   try this PR locally:

bunx bun-pr 16453