fix(response-interceptor): reduce responseInterceptor buffer churn

[chimurai]

fixes: #929
closes: #1235

Summary by CodeRabbit

• Bug Fixes

  • Optimized response interceptor buffering to improve performance and reduce overhead

• Tests

  • Added unit tests verifying response interceptor correctly buffers and concatenates multiple data chunks

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[pkg-pr-new]

npm i https://pkg.pr.new/http-proxy-middleware@1236

commit: c5bd0b4

[coveralls]

coverage: 94.315% (+0.1%) from 94.18% — improve-response-interceptor into master