Pass the pytest report log flag from the workflow instead of the Makefile

[albertvillanova]

Stacked on top of #6749.

This PR moves the pytest report log flag from the slow_tests Make target to the slow tests workflow.

Motivation

The report log is only needed by CI, where scripts/log_reports.py consumes it to build the job summary and the Slack report. Having the Make target check whether it runs in CI makes it aware of a concern that belongs to the workflow. Passing the flag from the caller keeps the target to a single job, running the slow tests.

Solution

The slow_tests target now forwards a PYTEST_ARGS variable to pytest, which is empty unless the caller sets it, and the workflow sets it to the report log flag. Running make slow_tests locally therefore no longer depends on pytest-reportlog being installed, and no longer needs any environment variable to behave as expected.

Changes

• Forward a PYTEST_ARGS variable to pytest in the slow_tests Make target, instead of adding the report log flag when GITHUB_ACTIONS is set
• Pass the report log flag from both slow tests jobs

---

Note

Low Risk
Makefile and workflow-only change; test behavior is unchanged except where CI explicitly passes the report log flag.

Overview
Moves pytest report logging out of the slow_tests Make target and into the slow-tests GitHub Actions workflow.

The slow_tests target now appends optional $(PYTEST_ARGS) to pytest instead of enabling --report-log when GITHUB_ACTIONS is set. Both single- and multi-GPU slow test jobs invoke make slow_tests PYTEST_ARGS="--report-log=slow_tests.log" so scripts/log_reports.py still gets the same log file for summaries and Slack.

Local make slow_tests no longer needs pytest-reportlog or CI env vars unless you pass your own PYTEST_ARGS.

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[bot-ci-comment]

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