ci: Improve benchmarking tests with CodSpeed

[Copilot]

Summary

Replace pytest-benchmark with pytest-codspeed for benchmarking, extend test coverage to full process lifecycle, and parameterize across connector types.

Changes

• pyproject.toml: Swap pytest-benchmark → pytest-codspeed>=4.3.0
• tests/benchmark/test_benchmarking.py:
  • test_benchmark_process_run — benchmarks init + run
  • test_benchmark_process_lifecycle — benchmarks full init → run → destroy
  • Both parameterized over AsyncioConnector and ZMQConnector
  • Uses @pytest.mark.benchmark decorator (CodSpeed-compatible)
• .github/workflows/benchmarks.yaml: Replace manual checkout-both-branches-and-compare workflow with CodSpeedHQ/action@v4. Adds push to main and workflow_dispatch triggers for baseline tracking and backtesting. Uses OIDC auth (id-token: write).
• uv.lock: Updated to reflect dependency change

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED (dns block)
• codspeed.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

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Original prompt

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This section details on the original issue you should resolve

<issue_title>ci: Improve benchmarking tests</issue_title>
<issue_description>### Summary

Use codspeed instead of the current solution for benchmarking tests, to provide better feedback in PRs.

Extend the benchmarking tests so that full process lifecycle is covered, as well as the existing test which just covers process run.

Add additional benchmark tests for the different connector types via parameterisation.

Example

No response

Alternatives

No response</issue_description>

<agent_instructions>See https://codspeed.io/docs/benchmarks/python for information on updating the Python tests.
Also make sure to replace the existing step in the Github action.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes ci: Improve benchmarking tests #234

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