fix: preserve body size limit error in fast-abort mode

[wahajahmed010]

Summary

Fixes #186 — When processDecompressedChunk hits maxBodySize in fastAbort mode, the original Body size limit exceeded error was being overwritten by Connection aborted when the onAborted callback fired.

Problem

1. In the size limit enforcement path (onChunk), uwsRes.close() was called without first setting this.abortError, so when onAborted fired, it unconditionally overwrote the error with Connection aborted
2. In test mocks where close() does not trigger onAborted, pending promises could hang forever

Changes

1. Set this.abortError to the Body size limit exceeded error before calling uwsRes.close() in the size limit path
2. Guard this.abortError assignment in onAborted to only set it when not already set:

if (!this.abortError) {
  this.abortError = new Error("Connection aborted");
}

Testing

• All 70 existing tests pass
• Added 2 new test cases:
  • should preserve original error when size limit exceeded before abort
  • should preserve original error even when onAborted overwrites would occur

Both tests verify that buffer() rejects with Body size limit exceeded even after onAborted fires, not Connection aborted.

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