Test: Add req and res streaming e2e tests

[VikramAditya33]

Tests added:

• Streaming large request bodies
• Chunked transfer encoding
• Backpressure handling during upload
• Connection abort during streaming
• Piping request to writable stream
• A bit more

Fixed eslint config for unused var

Closes #99

Summary by CodeRabbit

• Tests

  • Added comprehensive end-to-end test coverage for HTTP response lifecycle events and streaming scenarios.
  • Tests now validate response handling with multiple writes, chunked transfer encoding, content-length headers, backpressure handling, connection aborts, large payloads, data integrity, and non-POST methods.

• Chores

  • Updated ESLint configuration to refine unused variable suppression rules.

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@test/http/streaming-connection-abort.e2e.spec.ts`:
- Around line 148-152: The test currently calls req.destroy() then immediately
resolves the promise (using requestDestroyed = true; resolve()), which can let
the test pass without observing the actual transport abort event; change the
logic in the timeout handler to call req.destroy() and then wait for the
socket/request to emit a terminal event (listen for 'error' or 'close' on
req/req.socket) and only set requestDestroyed = true and resolve the promise
when one of those events fires (with a short safety timeout to fail if no event
arrives). Apply the same change to the other instance around lines 167-169 so
both cases wait for the real abort signal rather than resolving immediately.

In `@test/http/streaming-large-payloads.e2e.spec.ts`:
- Around line 30-32: The current Promise awaiting passthrough end only listens
for 'end' and can hang if either stream errors; change the Promise in the test
to accept (resolve, reject) and attach 'error' handlers on both passthrough and
req (e.g., passthrough.on('error', reject) and req.on('error', reject)) so the
promise rejects immediately on stream errors; also remove/cleanup listeners
after resolve/reject to avoid leaks and ensure the test fails fast.

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Fix all unresolved CodeRabbit comments on this PR:

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📥 Commits

Reviewing files that changed from the base of the PR and between 51ddc5c and b8fbeb3.

📒 Files selected for processing (15)

• eslint.config.mjs
• test/http/response-events.e2e.spec.ts
• test/http/response-multiple-writes.e2e.spec.ts
• test/http/response-stream-chunked.e2e.spec.ts
• test/http/response-stream-content-length.e2e.spec.ts
• test/http/response-stream-nodejs-piping.e2e.spec.ts
• test/http/response-stream-pipefrom.e2e.spec.ts
• test/http/streaming-backpressure.e2e.spec.ts
• test/http/streaming-chunked-transfer.e2e.spec.ts
• test/http/streaming-connection-abort.e2e.spec.ts
• test/http/streaming-data-integrity.e2e.spec.ts
• test/http/streaming-large-payloads.e2e.spec.ts
• test/http/streaming-non-post-methods.e2e.spec.ts
• test/http/streaming-pipe-buffer.e2e.spec.ts
• test/http/streaming-pipe-passthrough.e2e.spec.ts